Merge bc208baf6bbbcf50383df44041e1f92c1f500980 into f2d166b7fd4fa830ec06f487fcdcc64f1eacb4c9

commit: 2fd2ce08f3cf9928ed78c03cb7db60a0b5a6a1aa
author: ermite · 5h ago · 2026-10-22 20:26 UTC
merge of: f2d166b + bc208ba · diff against the first parent
signature: unsigned

6 files · +307 -3

M docs/config.md +2 -0


@@ -260,6 +260,8 @@ bind.XF86MonBrightnessDown = spawn brightnessctl set 5%-
260	260		\| `scale-up` / `scale-down` \| Zoom the display; the scale is saved to the config \|
261	261		\| `quit` \| Exit NeferWL \|
262	262
	263	+	A parentless window whose first committed size is exactly the logical size of the output it is on, without asking for fullscreen (a game in borderless-windowed mode), is put fullscreen as if by `toggle-fullscreen`, without being resized, when it is the focused window of the shown workspace. Later resizes do not.
	264	+
263	265		### Default binds
264	266
265	267		\| Keys \| Action \|


@@ -260,6 +260,8 @@ bind.XF86MonBrightnessDown = spawn brightnessctl set 5%-
260	\| `scale-up` / `scale-down` \| Zoom the display; the scale is saved to the config \|	260		\| `scale-up` / `scale-down` \| Zoom the display; the scale is saved to the config \|
261	\| `quit` \| Exit NeferWL \|	261		\| `quit` \| Exit NeferWL \|
262		262
		263	+	A parentless window whose first committed size is exactly the logical size of the output it is on, without asking for fullscreen (a game in borderless-windowed mode), is put fullscreen as if by `toggle-fullscreen`, without being resized, when it is the focused window of the shown workspace. Later resizes do not.
		264	+
263	### Default binds	265		### Default binds
264		266
265	\| Keys \| Action \|	267		\| Keys \| Action \|

A internal/adapters/wayland/legacy_fullscreen_test.go +59 -0

@@ -0,0 +1,59 @@
	1	+	package wayland
	2	+
	3	+	import (
	4	+	"context"
	5	+	"testing"
	6	+	"time"
	7	+
	8	+	"github.com/bnema/neferwl/internal/adapters/logging"
	9	+	"github.com/bnema/neferwl/internal/ports"
	10	+	)
	11	+
	12	+	// outputSizedServer runs a server whose only output is w×h logical.
	13	+	func outputSizedServer(t testing.T, w, h int) (Server, chan ports.ClientEvent, string) {
	14	+	t.Helper()
	15	+	dir := t.TempDir()
	16	+	events := make(chan ports.ClientEvent, 16)
	17	+	out := ports.Layout{{Info: ports.OutputInfo{Name: "HEADLESS-1", Width: w, Height: h}, Width: w, Height: h, Scale: 1}}
	18	+	s, err := New(Options{RuntimeDir: dir, Outputs: out}, Channels{Events: events, Commands: make(chan ports.ClientCommand, 16)}, logging.For(context.Background(), "wayland"))
	19	+	if err != nil {
	20	+	t.Fatal(err)
	21	+	}
	22	+	ctx, cancel := context.WithCancel(context.Background())
	23	+	done := make(chan error, 1)
	24	+	go func() { done <- s.Run(ctx) }()
	25	+	t.Cleanup(func() {
	26	+	cancel()
	27	+	<-done
	28	+	})
	29	+	return s, events, dir
	30	+	}
	31	+
	32	+	// A tiled toplevel whose first committed size is its output's size reports
	33	+	// it once (core then fullscreens it); a smaller one reports nothing.
	34	+	func TestTiledFirstSizeAtOutputSizeEmitsResized(t *testing.T) {
	35	+	s, events, dir := outputSizedServer(t, 1, 1)
	36	+	c := protocolClient(t, s, dir)
	37	+	w := toplevelMapper(t, c, events)()
	38	+	if w.Floating {
	39	+	t.Fatal("expected a tiled window")
	40	+	}
	41	+	ev := waitEvent(t, events, 2*time.Second)
	42	+	if r, ok := ev.(ports.WindowResized); !ok \|\| r.ID != w.ID \|\| r.Width != 1 \|\| r.Height != 1 {
	43	+	t.Fatalf("got %#v, want WindowResized 1x1 for %d", ev, w.ID)
	44	+	}
	45	+	}
	46	+
	47	+	func TestTiledSmallerThanOutputEmitsNoResized(t *testing.T) {
	48	+	s, events, dir := outputSizedServer(t, 2, 2)
	49	+	c := protocolClient(t, s, dir)
	50	+	toplevelMapper(t, c, events)()
	51	+	if err := c.Roundtrip(); err != nil {
	52	+	t.Fatal(err)
	53	+	}
	54	+	select {
	55	+	case ev := <-events:
	56	+	t.Fatalf("unexpected event %#v", ev)
	57	+	case <-time.After(200 * time.Millisecond):
	58	+	}
	59	+	}

@@ -0,0 +1,59 @@
	1	+	package wayland
	2	+
	3	+	import (
	4	+	"context"
	5	+	"testing"
	6	+	"time"
	7	+
	8	+	"github.com/bnema/neferwl/internal/adapters/logging"
	9	+	"github.com/bnema/neferwl/internal/ports"
	10	+	)
	11	+
	12	+	// outputSizedServer runs a server whose only output is w×h logical.
	13	+	func outputSizedServer(t testing.T, w, h int) (Server, chan ports.ClientEvent, string) {
	14	+	t.Helper()
	15	+	dir := t.TempDir()
	16	+	events := make(chan ports.ClientEvent, 16)
	17	+	out := ports.Layout{{Info: ports.OutputInfo{Name: "HEADLESS-1", Width: w, Height: h}, Width: w, Height: h, Scale: 1}}
	18	+	s, err := New(Options{RuntimeDir: dir, Outputs: out}, Channels{Events: events, Commands: make(chan ports.ClientCommand, 16)}, logging.For(context.Background(), "wayland"))
	19	+	if err != nil {
	20	+	t.Fatal(err)
	21	+	}
	22	+	ctx, cancel := context.WithCancel(context.Background())
	23	+	done := make(chan error, 1)
	24	+	go func() { done <- s.Run(ctx) }()
	25	+	t.Cleanup(func() {
	26	+	cancel()
	27	+	<-done
	28	+	})
	29	+	return s, events, dir
	30	+	}
	31	+
	32	+	// A tiled toplevel whose first committed size is its output's size reports
	33	+	// it once (core then fullscreens it); a smaller one reports nothing.
	34	+	func TestTiledFirstSizeAtOutputSizeEmitsResized(t *testing.T) {
	35	+	s, events, dir := outputSizedServer(t, 1, 1)
	36	+	c := protocolClient(t, s, dir)
	37	+	w := toplevelMapper(t, c, events)()
	38	+	if w.Floating {
	39	+	t.Fatal("expected a tiled window")
	40	+	}
	41	+	ev := waitEvent(t, events, 2*time.Second)
	42	+	if r, ok := ev.(ports.WindowResized); !ok \|\| r.ID != w.ID \|\| r.Width != 1 \|\| r.Height != 1 {
	43	+	t.Fatalf("got %#v, want WindowResized 1x1 for %d", ev, w.ID)
	44	+	}
	45	+	}
	46	+
	47	+	func TestTiledSmallerThanOutputEmitsNoResized(t *testing.T) {
	48	+	s, events, dir := outputSizedServer(t, 2, 2)
	49	+	c := protocolClient(t, s, dir)
	50	+	toplevelMapper(t, c, events)()
	51	+	if err := c.Roundtrip(); err != nil {
	52	+	t.Fatal(err)
	53	+	}
	54	+	select {
	55	+	case ev := <-events:
	56	+	t.Fatalf("unexpected event %#v", ev)
	57	+	case <-time.After(200 * time.Millisecond):
	58	+	}
	59	+	}

M internal/adapters/wayland/xdg.go +28 -2


@@ -145,7 +145,8 @@ type window struct {
145	145		minW, minH int32
146	146		maxW, maxH int32
147	147		floating bool
148		-	floatW, floatH int // size last sent to core
	148	+	floatW, floatH int // size last sent to core
	149	+	sized bool // the first committed size after a map was sent
149	150		// last is the most recent core configure, resent when decoration mode changes.
150	151		last ports.ConfigureWindow
151	152		hasLast bool

@@ -238,6 +239,7 @@ func (x xdgSurface) GetToplevel(r xdgshell.Surface, id uint32) {
238	239		x.serials = append(x.serials, x.server.serial)
239	240		} else if buffer && !w.mapped && x.acked {
240	241		w.mapped = true
	242	+	w.sized = false
241	243		w.gen++
242	244		// Placement claims are for a new toplevel, not later remaps.
243	245		// Ordinary commits, popups and remaps need no /proc lookup.

@@ -412,7 +414,21 @@ func (top) SetMinimized(*xdgshell.Toplevel) {}
412	414		// afterCommit runs once the commit applied content and geometry: a
413	415		// floating window keeps the size it draws.
414	416		func (w *window) afterCommit() {
415		-	if !w.mapped \|\| !w.floating {
	417	+	if !w.mapped {
	418	+	return
	419	+	}
	420	+	if !w.floating {
	421	+	// Core is authoritative: this prefilter matches any output, and
	422	+	// core compares with the output the window is on.
	423	+	// Core reads a tile's first size once, to spot a window that maps
	424	+	// at its output's size without asking for fullscreen.
	425	+	if fw, fh := w.size(); !w.sized && fw > 0 && fh > 0 {
	426	+	w.sized = true
	427	+	if !w.xdg.server.outputSized(fw, fh) {
	428	+	return
	429	+	}
	430	+	w.xdg.server.emit(ports.WindowResized{ID: w.id, Width: fw, Height: fh})
	431	+	}
416	432		return
417	433		}
418	434		if fw, fh := w.size(); fw > 0 && fh > 0 && (fw != w.floatW \|\| fh != w.floatH) {

@@ -453,3 +469,13 @@ func (x xdgSurface) surfaceResource() wayland.Surface {
453	469		}
454	470		return nil
455	471		}
	472	+
	473	+	// outputSized reports whether an output has the logical size w×h.
	474	+	func (s *Server) outputSized(w, h int) bool {
	475	+	for _, o := range s.outputs {
	476	+	if o.place.Width == w && o.place.Height == h {
	477	+	return true
	478	+	}
	479	+	}
	480	+	return false
	481	+	}


@@ -145,7 +145,8 @@ type window struct {
145		minW, minH int32	145		minW, minH int32
146		maxW, maxH int32	146		maxW, maxH int32
147		floating bool	147		floating bool
148	-	floatW, floatH int // size last sent to core	148	+	floatW, floatH int // size last sent to core
			149	+	sized bool // the first committed size after a map was sent
149		// last is the most recent core configure, resent when decoration mode changes.	150		// last is the most recent core configure, resent when decoration mode changes.
150		last ports.ConfigureWindow	151		last ports.ConfigureWindow
151		hasLast bool	152		hasLast bool

@@ -238,6 +239,7 @@ func (x xdgSurface) GetToplevel(r xdgshell.Surface, id uint32) {
238		x.serials = append(x.serials, x.server.serial)	239		x.serials = append(x.serials, x.server.serial)
239		} else if buffer && !w.mapped && x.acked {	240		} else if buffer && !w.mapped && x.acked {
240		w.mapped = true	241		w.mapped = true
			242	+	w.sized = false
241		w.gen++	243		w.gen++
242		// Placement claims are for a new toplevel, not later remaps.	244		// Placement claims are for a new toplevel, not later remaps.
243		// Ordinary commits, popups and remaps need no /proc lookup.	245		// Ordinary commits, popups and remaps need no /proc lookup.

@@ -412,7 +414,21 @@ func (top) SetMinimized(*xdgshell.Toplevel) {}
412		// afterCommit runs once the commit applied content and geometry: a	414		// afterCommit runs once the commit applied content and geometry: a
413		// floating window keeps the size it draws.	415		// floating window keeps the size it draws.
414		func (w *window) afterCommit() {	416		func (w *window) afterCommit() {
415	-	if !w.mapped \|\| !w.floating {	417	+	if !w.mapped {
			418	+	return
			419	+	}
			420	+	if !w.floating {
			421	+	// Core is authoritative: this prefilter matches any output, and
			422	+	// core compares with the output the window is on.
			423	+	// Core reads a tile's first size once, to spot a window that maps
			424	+	// at its output's size without asking for fullscreen.
			425	+	if fw, fh := w.size(); !w.sized && fw > 0 && fh > 0 {
			426	+	w.sized = true
			427	+	if !w.xdg.server.outputSized(fw, fh) {
			428	+	return
			429	+	}
			430	+	w.xdg.server.emit(ports.WindowResized{ID: w.id, Width: fw, Height: fh})
			431	+	}
416		return	432		return
417		}	433		}
418		if fw, fh := w.size(); fw > 0 && fh > 0 && (fw != w.floatW \|\| fh != w.floatH) {	434		if fw, fh := w.size(); fw > 0 && fh > 0 && (fw != w.floatW \|\| fh != w.floatH) {

@@ -453,3 +469,13 @@ func (x xdgSurface) surfaceResource() wayland.Surface {
453		}	469		}
454		return nil	470		return nil
455		}	471		}
			472	+
			473	+	// outputSized reports whether an output has the logical size w×h.
			474	+	func (s *Server) outputSized(w, h int) bool {
			475	+	for _, o := range s.outputs {
			476	+	if o.place.Width == w && o.place.Height == h {
			477	+	return true
			478	+	}
			479	+	}
			480	+	return false
			481	+	}

A internal/core/legacy_fullscreen_internal_test.go +169 -0

@@ -0,0 +1,169 @@
	1	+	package core
	2	+
	3	+	import (
	4	+	"testing"
	5	+
	6	+	"github.com/bnema/neferwl/internal/ports"
	7	+	)
	8	+
	9	+	// A window whose first committed size is its output's size goes fullscreen,
	10	+	// focused, exactly as toggle-fullscreen does, and toggling leaves it.
	11	+	func TestLegacyFullscreenAtOutputSize(t *testing.T) {
	12	+	c, _, _ := fadeCore(t)
	13	+	sc := c.cur()
	14	+	c.mapWindow(ports.WindowMapped{ID: 1})
	15	+	c.mapWindow(ports.WindowMapped{ID: 2})
	16	+	o := sc.rect()
	17	+	c.resizeFloating(ports.WindowResized{ID: 2, Width: o.W, Height: o.H})
	18	+	w := sc.mon.Current()
	19	+	if w.fullscreen != 2 {
	20	+	t.Fatalf("fullscreen = %d, want 2", w.fullscreen)
	21	+	}
	22	+	if id, _ := w.Focused(); id != 2 {
	23	+	t.Fatalf("focused %d, want 2", id)
	24	+	}
	25	+	sc.mon.ToggleFullscreen()
	26	+	if w.fullscreen != 0 {
	27	+	t.Fatalf("toggle left fullscreen = %d", w.fullscreen)
	28	+	}
	29	+	}
	30	+
	31	+	func TestLegacyFullscreenFloatingFixedSize(t *testing.T) {
	32	+	c, _, _ := fadeCore(t)
	33	+	sc := c.cur()
	34	+	c.mapWindow(ports.WindowMapped{ID: 1, Floating: true})
	35	+	o := sc.rect()
	36	+	c.resizeFloating(ports.WindowResized{ID: 1, Width: o.W, Height: o.H})
	37	+	if sc.mon.Current().fullscreen != 1 {
	38	+	t.Fatal("a screen-sized float did not go fullscreen")
	39	+	}
	40	+	}
	41	+
	42	+	func TestLegacyFullscreenNoFalsePositive(t *testing.T) {
	43	+	t.Run("smaller", func(t *testing.T) {
	44	+	c, _, _ := fadeCore(t)
	45	+	sc := c.cur()
	46	+	c.mapWindow(ports.WindowMapped{ID: 1})
	47	+	o := sc.rect()
	48	+	c.resizeFloating(ports.WindowResized{ID: 1, Width: o.W - 1, Height: o.H})
	49	+	if sc.mon.Current().fullscreen != 0 {
	50	+	t.Fatal("smaller window went fullscreen")
	51	+	}
	52	+	})
	53	+	t.Run("parent", func(t *testing.T) {
	54	+	c, _, _ := fadeCore(t)
	55	+	sc := c.cur()
	56	+	c.mapWindow(ports.WindowMapped{ID: 1})
	57	+	c.mapWindow(ports.WindowMapped{ID: 2, Floating: true, Parent: 1})
	58	+	o := sc.rect()
	59	+	c.resizeFloating(ports.WindowResized{ID: 2, Width: o.W, Height: o.H})
	60	+	if sc.mon.Current().fullscreen != 0 {
	61	+	t.Fatal("dialog went fullscreen")
	62	+	}
	63	+	})
	64	+	t.Run("later resize", func(t *testing.T) {
	65	+	c, _, _ := fadeCore(t)
	66	+	sc := c.cur()
	67	+	c.mapWindow(ports.WindowMapped{ID: 1})
	68	+	o := sc.rect()
	69	+	c.resizeFloating(ports.WindowResized{ID: 1, Width: 50, Height: 50})
	70	+	c.resizeFloating(ports.WindowResized{ID: 1, Width: o.W, Height: o.H})
	71	+	if sc.mon.Current().fullscreen != 0 {
	72	+	t.Fatal("a later resize went fullscreen")
	73	+	}
	74	+	})
	75	+	}
	76	+
	77	+	// With animations on, the entrance never restarts for the window that went
	78	+	// fullscreen: no motion, and the scene shows it at the full output.
	79	+	func TestLegacyFullscreenDropsEntrance(t *testing.T) {
	80	+	c, _, _ := fadeCore(t)
	81	+	c.cfg.Animations.On = true
	82	+	sc := c.cur()
	83	+	c.mapWindow(ports.WindowMapped{ID: 1})
	84	+	c.stopAnimations()
	85	+	c.mapWindow(ports.WindowMapped{ID: 2})
	86	+	o := sc.rect()
	87	+	c.resizeFloating(ports.WindowResized{ID: 2, Width: o.W, Height: o.H})
	88	+	s := indicatorScene(t, c)
	89	+	if _, ok := sc.rects[2]; ok {
	90	+	t.Fatalf("entrance motion left for the fullscreen window: %+v", sc.rects)
	91	+	}
	92	+	if w := sceneWindow(t, s, 2); w.Rect != (Rect{W: o.W, H: o.H}) \|\| w.Fade != 0 {
	93	+	t.Fatalf("scene window %+v, want the full output %+v", w, o)
	94	+	}
	95	+	}
	96	+
	97	+	// Focus rules (ADR 011): never takes the focus from a fullscreen cover, nor
	98	+	// acts on a workspace that is not shown.
	99	+	func TestLegacyFullscreenRespectsFocus(t *testing.T) {
	100	+	t.Run("under a fullscreen window", func(t *testing.T) {
	101	+	c, _, _ := fadeCore(t)
	102	+	sc := c.cur()
	103	+	c.mapWindow(ports.WindowMapped{ID: 1})
	104	+	sc.mon.SetFullscreen(1, true)
	105	+	c.mapWindow(ports.WindowMapped{ID: 2})
	106	+	o := sc.rect()
	107	+	c.resizeFloating(ports.WindowResized{ID: 2, Width: o.W, Height: o.H})
	108	+	w := sc.mon.Current()
	109	+	if w.fullscreen != 1 {
	110	+	t.Fatalf("fullscreen = %d, want the cover 1", w.fullscreen)
	111	+	}
	112	+	if id, _ := w.Focused(); id != 1 {
	113	+	t.Fatalf("focus moved to %d", id)
	114	+	}
	115	+	})
	116	+	t.Run("other workspace", func(t *testing.T) {
	117	+	c, _, _ := fadeCore(t)
	118	+	sc := c.cur()
	119	+	c.mapWindow(ports.WindowMapped{ID: 1})
	120	+	ws := sc.mon.Current()
	121	+	sc.mon.Focus(1)
	122	+	if sc.mon.Current() == ws {
	123	+	t.Skip("no second workspace")
	124	+	}
	125	+	o := sc.rect()
	126	+	c.resizeFloating(ports.WindowResized{ID: 1, Width: o.W, Height: o.H})
	127	+	if ws.fullscreen != 0 {
	128	+	t.Fatal("a window on a hidden workspace went fullscreen")
	129	+	}
	130	+	})
	131	+	}
	132	+
	133	+	func TestLegacyFullscreenRemapAndOutputs(t *testing.T) {
	134	+	t.Run("remap", func(t *testing.T) {
	135	+	c, _, _ := fadeCore(t)
	136	+	sc := c.cur()
	137	+	c.mapWindow(ports.WindowMapped{ID: 1, Remap: true})
	138	+	o := sc.rect()
	139	+	c.resizeFloating(ports.WindowResized{ID: 1, Width: o.W, Height: o.H})
	140	+	if sc.mon.Current().fullscreen != 0 {
	141	+	t.Fatal("a remap went fullscreen")
	142	+	}
	143	+	})
	144	+	second := func(t testing.T) (Core, *screen) {
	145	+	c, _, _ := fadeCore(t)
	146	+	c.addScreen(ports.OutputInfo{Name: "B", Width: 500, Height: 300})
	147	+	c.focusScreen = c.screenIndex("B")
	148	+	return c, c.cur()
	149	+	}
	150	+	t.Run("sized to its own output", func(t *testing.T) {
	151	+	c, b := second(t)
	152	+	c.mapWindow(ports.WindowMapped{ID: 1})
	153	+	if s, _ := c.screenOf(1); s != b {
	154	+	t.Fatal("window not on B")
	155	+	}
	156	+	c.resizeFloating(ports.WindowResized{ID: 1, Width: 500, Height: 300})
	157	+	if b.mon.Current().fullscreen != 1 {
	158	+	t.Fatal("window sized to its output B did not go fullscreen")
	159	+	}
	160	+	})
	161	+	t.Run("sized to another output", func(t *testing.T) {
	162	+	c, b := second(t)
	163	+	c.mapWindow(ports.WindowMapped{ID: 1})
	164	+	c.resizeFloating(ports.WindowResized{ID: 1, Width: 300, Height: 200})
	165	+	if b.mon.Current().fullscreen != 0 {
	166	+	t.Fatal("window sized to output A went fullscreen on B")
	167	+	}
	168	+	})
	169	+	}

@@ -0,0 +1,169 @@
	1	+	package core
	2	+
	3	+	import (
	4	+	"testing"
	5	+
	6	+	"github.com/bnema/neferwl/internal/ports"
	7	+	)
	8	+
	9	+	// A window whose first committed size is its output's size goes fullscreen,
	10	+	// focused, exactly as toggle-fullscreen does, and toggling leaves it.
	11	+	func TestLegacyFullscreenAtOutputSize(t *testing.T) {
	12	+	c, _, _ := fadeCore(t)
	13	+	sc := c.cur()
	14	+	c.mapWindow(ports.WindowMapped{ID: 1})
	15	+	c.mapWindow(ports.WindowMapped{ID: 2})
	16	+	o := sc.rect()
	17	+	c.resizeFloating(ports.WindowResized{ID: 2, Width: o.W, Height: o.H})
	18	+	w := sc.mon.Current()
	19	+	if w.fullscreen != 2 {
	20	+	t.Fatalf("fullscreen = %d, want 2", w.fullscreen)
	21	+	}
	22	+	if id, _ := w.Focused(); id != 2 {
	23	+	t.Fatalf("focused %d, want 2", id)
	24	+	}
	25	+	sc.mon.ToggleFullscreen()
	26	+	if w.fullscreen != 0 {
	27	+	t.Fatalf("toggle left fullscreen = %d", w.fullscreen)
	28	+	}
	29	+	}
	30	+
	31	+	func TestLegacyFullscreenFloatingFixedSize(t *testing.T) {
	32	+	c, _, _ := fadeCore(t)
	33	+	sc := c.cur()
	34	+	c.mapWindow(ports.WindowMapped{ID: 1, Floating: true})
	35	+	o := sc.rect()
	36	+	c.resizeFloating(ports.WindowResized{ID: 1, Width: o.W, Height: o.H})
	37	+	if sc.mon.Current().fullscreen != 1 {
	38	+	t.Fatal("a screen-sized float did not go fullscreen")
	39	+	}
	40	+	}
	41	+
	42	+	func TestLegacyFullscreenNoFalsePositive(t *testing.T) {
	43	+	t.Run("smaller", func(t *testing.T) {
	44	+	c, _, _ := fadeCore(t)
	45	+	sc := c.cur()
	46	+	c.mapWindow(ports.WindowMapped{ID: 1})
	47	+	o := sc.rect()
	48	+	c.resizeFloating(ports.WindowResized{ID: 1, Width: o.W - 1, Height: o.H})
	49	+	if sc.mon.Current().fullscreen != 0 {
	50	+	t.Fatal("smaller window went fullscreen")
	51	+	}
	52	+	})
	53	+	t.Run("parent", func(t *testing.T) {
	54	+	c, _, _ := fadeCore(t)
	55	+	sc := c.cur()
	56	+	c.mapWindow(ports.WindowMapped{ID: 1})
	57	+	c.mapWindow(ports.WindowMapped{ID: 2, Floating: true, Parent: 1})
	58	+	o := sc.rect()
	59	+	c.resizeFloating(ports.WindowResized{ID: 2, Width: o.W, Height: o.H})
	60	+	if sc.mon.Current().fullscreen != 0 {
	61	+	t.Fatal("dialog went fullscreen")
	62	+	}
	63	+	})
	64	+	t.Run("later resize", func(t *testing.T) {
	65	+	c, _, _ := fadeCore(t)
	66	+	sc := c.cur()
	67	+	c.mapWindow(ports.WindowMapped{ID: 1})
	68	+	o := sc.rect()
	69	+	c.resizeFloating(ports.WindowResized{ID: 1, Width: 50, Height: 50})
	70	+	c.resizeFloating(ports.WindowResized{ID: 1, Width: o.W, Height: o.H})
	71	+	if sc.mon.Current().fullscreen != 0 {
	72	+	t.Fatal("a later resize went fullscreen")
	73	+	}
	74	+	})
	75	+	}
	76	+
	77	+	// With animations on, the entrance never restarts for the window that went
	78	+	// fullscreen: no motion, and the scene shows it at the full output.
	79	+	func TestLegacyFullscreenDropsEntrance(t *testing.T) {
	80	+	c, _, _ := fadeCore(t)
	81	+	c.cfg.Animations.On = true
	82	+	sc := c.cur()
	83	+	c.mapWindow(ports.WindowMapped{ID: 1})
	84	+	c.stopAnimations()
	85	+	c.mapWindow(ports.WindowMapped{ID: 2})
	86	+	o := sc.rect()
	87	+	c.resizeFloating(ports.WindowResized{ID: 2, Width: o.W, Height: o.H})
	88	+	s := indicatorScene(t, c)
	89	+	if _, ok := sc.rects[2]; ok {
	90	+	t.Fatalf("entrance motion left for the fullscreen window: %+v", sc.rects)
	91	+	}
	92	+	if w := sceneWindow(t, s, 2); w.Rect != (Rect{W: o.W, H: o.H}) \|\| w.Fade != 0 {
	93	+	t.Fatalf("scene window %+v, want the full output %+v", w, o)
	94	+	}
	95	+	}
	96	+
	97	+	// Focus rules (ADR 011): never takes the focus from a fullscreen cover, nor
	98	+	// acts on a workspace that is not shown.
	99	+	func TestLegacyFullscreenRespectsFocus(t *testing.T) {
	100	+	t.Run("under a fullscreen window", func(t *testing.T) {
	101	+	c, _, _ := fadeCore(t)
	102	+	sc := c.cur()
	103	+	c.mapWindow(ports.WindowMapped{ID: 1})
	104	+	sc.mon.SetFullscreen(1, true)
	105	+	c.mapWindow(ports.WindowMapped{ID: 2})
	106	+	o := sc.rect()
	107	+	c.resizeFloating(ports.WindowResized{ID: 2, Width: o.W, Height: o.H})
	108	+	w := sc.mon.Current()
	109	+	if w.fullscreen != 1 {
	110	+	t.Fatalf("fullscreen = %d, want the cover 1", w.fullscreen)
	111	+	}
	112	+	if id, _ := w.Focused(); id != 1 {
	113	+	t.Fatalf("focus moved to %d", id)
	114	+	}
	115	+	})
	116	+	t.Run("other workspace", func(t *testing.T) {
	117	+	c, _, _ := fadeCore(t)
	118	+	sc := c.cur()
	119	+	c.mapWindow(ports.WindowMapped{ID: 1})
	120	+	ws := sc.mon.Current()
	121	+	sc.mon.Focus(1)
	122	+	if sc.mon.Current() == ws {
	123	+	t.Skip("no second workspace")
	124	+	}
	125	+	o := sc.rect()
	126	+	c.resizeFloating(ports.WindowResized{ID: 1, Width: o.W, Height: o.H})
	127	+	if ws.fullscreen != 0 {
	128	+	t.Fatal("a window on a hidden workspace went fullscreen")
	129	+	}
	130	+	})
	131	+	}
	132	+
	133	+	func TestLegacyFullscreenRemapAndOutputs(t *testing.T) {
	134	+	t.Run("remap", func(t *testing.T) {
	135	+	c, _, _ := fadeCore(t)
	136	+	sc := c.cur()
	137	+	c.mapWindow(ports.WindowMapped{ID: 1, Remap: true})
	138	+	o := sc.rect()
	139	+	c.resizeFloating(ports.WindowResized{ID: 1, Width: o.W, Height: o.H})
	140	+	if sc.mon.Current().fullscreen != 0 {
	141	+	t.Fatal("a remap went fullscreen")
	142	+	}
	143	+	})
	144	+	second := func(t testing.T) (Core, *screen) {
	145	+	c, _, _ := fadeCore(t)
	146	+	c.addScreen(ports.OutputInfo{Name: "B", Width: 500, Height: 300})
	147	+	c.focusScreen = c.screenIndex("B")
	148	+	return c, c.cur()
	149	+	}
	150	+	t.Run("sized to its own output", func(t *testing.T) {
	151	+	c, b := second(t)
	152	+	c.mapWindow(ports.WindowMapped{ID: 1})
	153	+	if s, _ := c.screenOf(1); s != b {
	154	+	t.Fatal("window not on B")
	155	+	}
	156	+	c.resizeFloating(ports.WindowResized{ID: 1, Width: 500, Height: 300})
	157	+	if b.mon.Current().fullscreen != 1 {
	158	+	t.Fatal("window sized to its output B did not go fullscreen")
	159	+	}
	160	+	})
	161	+	t.Run("sized to another output", func(t *testing.T) {
	162	+	c, b := second(t)
	163	+	c.mapWindow(ports.WindowMapped{ID: 1})
	164	+	c.resizeFloating(ports.WindowResized{ID: 1, Width: 300, Height: 200})
	165	+	if b.mon.Current().fullscreen != 0 {
	166	+	t.Fatal("window sized to output A went fullscreen on B")
	167	+	}
	168	+	})
	169	+	}

M internal/core/transition.go +35 -0


@@ -518,6 +518,9 @@ func (c *Core) resizeFloating(v ports.WindowResized) {
518	518		old = settledRect(sc.mon, v.ID)
519	519		}
520	520		w.ResizeFloating(v.ID, v.Width, v.Height)
	521	+	if c.legacyFullscreen(sc, v) {
	522	+	return
	523	+	}
521	524		if !running {
522	525		return
523	526		}

@@ -981,3 +984,35 @@ func movedFrom(b viewShot, before []viewShot) viewShot {
981	984		}
982	985		return nil
983	986		}
	987	+
	988	+	// legacyFullscreen puts a window in the fullscreen state when the first size
	989	+	// it commits after mapping is exactly the logical size of the output it is
	990	+	// on: a game in borderless-windowed mode (X11 through xwayland-satellite)
	991	+	// never asks for fullscreen. It is the state toggle-fullscreen sets, and the
	992	+	// window is not resized. It follows the focus rules (ADR 011): only the
	993	+	// window that already has the focus on the shown workspace goes fullscreen,
	994	+	// so a fullscreen cover or another workspace is never disturbed. The parent
	995	+	// is the one read at map (a later set_parent is not excluded); remaps and
	996	+	// later resizes are left alone. It reports whether the window went
	997	+	// fullscreen.
	998	+	func (c Core) legacyFullscreen(sc screen, v ports.WindowResized) bool {
	999	+	if !c.windows.firstSize(v.ID) {
	1000	+	return false
	1001	+	}
	1002	+	if rec := c.windows.lookup(v.ID); rec.client.Parent != 0 \|\| rec.client.Remap {
	1003	+	return false
	1004	+	}
	1005	+	if r := sc.rect(); v.Width != r.W \|\| v.Height != r.H \|\| r.W <= 0 {
	1006	+	return false
	1007	+	}
	1008	+	cur := sc.mon.Current()
	1009	+	if id, ok := cur.Focused(); !ok \|\| id != v.ID \|\| !cur.has(v.ID) {
	1010	+	return false
	1011	+	}
	1012	+	sc.mon.SetFullscreen(v.ID, true)
	1013	+	if cur.fullscreen != v.ID {
	1014	+	return false
	1015	+	}
	1016	+	delete(sc.rects, v.ID)
	1017	+	return true
	1018	+	}


@@ -518,6 +518,9 @@ func (c *Core) resizeFloating(v ports.WindowResized) {
518	old = settledRect(sc.mon, v.ID)	518		old = settledRect(sc.mon, v.ID)
519	}	519		}
520	w.ResizeFloating(v.ID, v.Width, v.Height)	520		w.ResizeFloating(v.ID, v.Width, v.Height)
		521	+	if c.legacyFullscreen(sc, v) {
		522	+	return
		523	+	}
521	if !running {	524		if !running {
522	return	525		return
523	}	526		}

@@ -981,3 +984,35 @@ func movedFrom(b viewShot, before []viewShot) viewShot {
981	}	984		}
982	return nil	985		return nil
983	}	986		}
		987	+
		988	+	// legacyFullscreen puts a window in the fullscreen state when the first size
		989	+	// it commits after mapping is exactly the logical size of the output it is
		990	+	// on: a game in borderless-windowed mode (X11 through xwayland-satellite)
		991	+	// never asks for fullscreen. It is the state toggle-fullscreen sets, and the
		992	+	// window is not resized. It follows the focus rules (ADR 011): only the
		993	+	// window that already has the focus on the shown workspace goes fullscreen,
		994	+	// so a fullscreen cover or another workspace is never disturbed. The parent
		995	+	// is the one read at map (a later set_parent is not excluded); remaps and
		996	+	// later resizes are left alone. It reports whether the window went
		997	+	// fullscreen.
		998	+	func (c Core) legacyFullscreen(sc screen, v ports.WindowResized) bool {
		999	+	if !c.windows.firstSize(v.ID) {
		1000	+	return false
		1001	+	}
		1002	+	if rec := c.windows.lookup(v.ID); rec.client.Parent != 0 \|\| rec.client.Remap {
		1003	+	return false
		1004	+	}
		1005	+	if r := sc.rect(); v.Width != r.W \|\| v.Height != r.H \|\| r.W <= 0 {
		1006	+	return false
		1007	+	}
		1008	+	cur := sc.mon.Current()
		1009	+	if id, ok := cur.Focused(); !ok \|\| id != v.ID \|\| !cur.has(v.ID) {
		1010	+	return false
		1011	+	}
		1012	+	sc.mon.SetFullscreen(v.ID, true)
		1013	+	if cur.fullscreen != v.ID {
		1014	+	return false
		1015	+	}
		1016	+	delete(sc.rects, v.ID)
		1017	+	return true
		1018	+	}

M internal/core/windows.go +14 -1


@@ -12,6 +12,8 @@ type windowRecord struct {
12	12		// client holds the app ID and PID of a mapped window, for State.
13	13		client ports.WindowMapped
14	14		mappedAt time.Time
	15	+	// sized is set once the window's first committed size was seen.
	16	+	sized bool
15	17		// region is the input region; nil accepts input everywhere.
16	18		region *ports.InputRegionChanged
17	19		// inhibitShortcuts asks to keep compositor binds while focused;

@@ -50,7 +52,18 @@ func (r *windowRegistry) lookup(id WindowID) windowRecord {
50	52
51	53		func (r *windowRegistry) mapped(v ports.WindowMapped, now time.Time) {
52	54		rec := r.at(v.ID)
53		-	rec.client, rec.mappedAt = v, now
	55	+	rec.client, rec.mappedAt, rec.sized = v, now, false
	56	+	}
	57	+
	58	+	// firstSize reports whether this is the first committed size of the window
	59	+	// since it mapped, and records that it was seen.
	60	+	func (r *windowRegistry) firstSize(id WindowID) bool {
	61	+	rec := r.records[id]
	62	+	if rec == nil \|\| rec.sized \|\| rec.client.ID == 0 {
	63	+	return false
	64	+	}
	65	+	rec.sized = true
	66	+	return true
54	67		}
55	68
56	69		// setAppID updates the app ID of a mapped window only.

 	// client holds the app ID and PID of a mapped window, for State.
 	client   ports.WindowMapped
 	mappedAt time.Time
+	// sized is set once the window's first committed size was seen.
+	sized bool
 	// region is the input region; nil accepts input everywhere.
 	region *ports.InputRegionChanged
 	// inhibitShortcuts asks to keep compositor binds while focused;
 func (r *windowRegistry) mapped(v ports.WindowMapped, now time.Time) {
 	rec := r.at(v.ID)
-	rec.client, rec.mappedAt = v, now
+	rec.client, rec.mappedAt, rec.sized = v, now, false
+}
+// firstSize reports whether this is the first committed size of the window
+// since it mapped, and records that it was seen.
+func (r *windowRegistry) firstSize(id WindowID) bool {
+	rec := r.records[id]
+	if rec == nil || rec.sized || rec.client.ID == 0 {
+		return false
+	}
+	rec.sized = true
+	return true
 }
 // setAppID updates the app ID of a mapped window only.