DRAFT: feat: title label

[devojoni]

Summary

NOTE: This is a feature I found myself thinking about a lot. This was implemented with the heavy use of Claude. I put this pull request up just in case someone else would like to take ownership of this feature and maybe finds some worth in the code. In all honesty I don't understand all of the code properly and have most likely misunderstood a good chunk of the rest.

Adds a label decoration mode — a small floating title chip that overlaps window content instead of reserving a full-width titlebar strip. Configurable edge/alignment, max width (px or %), corner radius (fixed or match-window), focus-based autohide, and cursor-avoidance slide. Works independently of border mode; suppresses the reserved titlebar strip when combined with border normal. Applies to leaf view containers (tabbed/stacked tab-strip entries are unaffected — out of scope for v1).

New command: label enable|disable|toggle|position|max_width|corner_radius|autohide|avoid_cursor (see sway.5 for full syntax — man page entry included in this PR).

Test plan

• label enable on tiled + floating windows, all four border modes (none/pixel/normal/csd) — content fills the window, no reserved strip, label renders sized to the title text (not window width).
• label position all 6 combinations; max_width in both px and % form, confirm it never exceeds the window width.
• label corner_radius vs match (including live-follow when the window's own corner_radius changes at runtime).
• border normal + label enable together on the same window — only the label shows, never both.
• Drag on the label behaves like a normal titlebar; clicks outside its bounds pass through to content.
• label autohide : label shows on focus, fades after the delay regardless of continued focus; losing focus always restores full visibility immediately.
• label avoid_cursor on: label slides away from the pointer and back; hovering also cancels a pending autohide fade.

Known limitations

• Tabbed/stacked tab-strip entries donign, v1 scope). A few minor polish items remain (docon-finite max_width/corner_radius input isn't rejected, avoid-cursor sweeps er than just the visible output.

Some screenshots and clips

With window border

Without window border

Different positions

Different radi

Maximum width

label_drag.mp4

label_autohide.mp4

label_avoid_cursor.mp4