feat(ext-panel): allow invisible selection marker via U+200B

ext_panel_dialog.Render sniffs the leading glyph of each panel line
to decide which row is selected and apply the theme's selection
band: today that's '> ' (U+25B8) or '* ' (U+25CF), both visible.
Extensions that want the highlight without a visible glyph had no
way to opt in - they had to ship the arrow.

Adds U+200B (zero-width space) as a third recognised prefix.
Extensions can now emit '\u200B' at the start of the selected row
to get the blue selection band without any visible marker; the
character renders as zero columns so other rows that omit it line
up perfectly. The visible arrow markers keep working unchanged.

Used by zot-workspaces to highlight the cursor row without
inserting a triangle into the otherwise clean list.

commit: d46f1d58245096b11e540ecf2124c6b1ea4682d1
author: patriceckhart · 5mo ago · 2026-05-19 17:48 UTC
parent: e48f4dd
signature: unsigned
refs: tag: v0.1.86

1 file · +8 -1

M internal/agent/modes/ext_panel_dialog.go +8 -1


@@ -63,7 +63,14 @@ func (d *extPanelDialog) Render(th tui.Theme, width int) []string {
63	63		for _, l := range d.lines {
64	64		plain := stripANSIBytes(l)
65	65		trimmed := strings.TrimLeft(plain, " ")
66		-	selected := strings.HasPrefix(trimmed, "▸ ") \|\| strings.HasPrefix(trimmed, "● ")
	66	+	// Selection markers, in order of precedence:
	67	+	// "▸ " / "● " visible glyph the user sees
	68	+	// "\u200b" invisible zero-width-space sentinel for
	69	+	// extensions that want the row highlight
	70	+	// without rendering an arrow
	71	+	selected := strings.HasPrefix(trimmed, "▸ ") \|\|
	72	+	strings.HasPrefix(trimmed, "● ") \|\|
	73	+	strings.HasPrefix(trimmed, "\u200b")
67	74		out = append(out, styleExtPanelLine(th, l, plain, width, selected))
68	75		}
69	76		if strings.TrimSpace(d.footer) != "" {

 	for _, l := range d.lines {
 		plain := stripANSIBytes(l)
 		trimmed := strings.TrimLeft(plain, " ")
-		selected := strings.HasPrefix(trimmed, "▸ ") || strings.HasPrefix(trimmed, "● ")
+		// Selection markers, in order of precedence:
+		//   "▸ " / "● "  visible glyph the user sees
+		//   "\u200b"      invisible zero-width-space sentinel for
+		//                 extensions that want the row highlight
+		//                 without rendering an arrow
+		selected := strings.HasPrefix(trimmed, "▸ ") ||
+			strings.HasPrefix(trimmed, "● ") ||
+			strings.HasPrefix(trimmed, "\u200b")
 		out = append(out, styleExtPanelLine(th, l, plain, width, selected))
 	}
 	if strings.TrimSpace(d.footer) != "" {