Spike: KWin input-method backend with floating layer-shell window

Registers as KWin's virtual keyboard (input-method-unstable-v1), shows a
non-focusable layer-shell overlay, and commits Unicode text. Verified in a
nested headless KWin with the textprobe tool.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
2026-10-14 14:43:44 +02:00
co-authored by Claude Opus 5.5
commit cdef9b4ad0
15 changed files with 612 additions and 0 deletions
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build/
.cache/
*.user