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A new standard-tier extension that composites a desktop background in the
'background' scene layer, below every window. Reads [wallpaper] from unbox.toml
(path / fit = cover|contain|stretch|center / color), hot-reloaded via watch_file
(drop + recreate an inline RCSS document with the values baked in -- avoids
fragile decorator data-binding). The surface is input_transparent so it never
steals clicks. Pure doctested config core; factory-only contract.
When no path is configured it falls back to a bundled default image
(assets/ext-wallpaper/default.jpg, auto-installed to the data dir), resolved to an
absolute path via $UNBOX_ASSET_DIR or the UNBOX_ASSET_DIR_DEFAULT compile define.
Degrades gracefully (color-only) if there is no GL path or the file is missing.
Sized to the primary output (multi-output is a documented gap).
Wiring (composition root): root meson subdir, host-bin installs it unconditionally
with the config path, unbox.toml gains a documented [wallpaper] sample.
(swaybg via ext-layer-shell's background band keeps working too.)
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Floating windows: move (titlebar), resize (two bottom corner grips), and a per-
window close button. Per-window geometry (x,y,w,h,z) is bound STATE applied via
data-style left/top/width/height + z-index; a pure, doctested geometry core
(move / resize_bl / resize_br with anchored-opposite-edge + min-size, field
clamp) computes drag results. Positioning uses left/top (NOT a transform: RmlUi's
data-style does not apply a transform here the way it does left/top/width/height,
and a transform would also offset the drag hit-test). z-order raise on focus;
cascade placement from the client's own size.
Resize-to-tile: a frame-pumped feedback loop configures each client to its on-
screen box (Toplevel::set_size) so the live texture maps 1:1. Policy is config-
driven -- [window-field] resize_mode = off|settle|continuous|debounced in
unbox.toml, hot-reloaded; pure doctested config core.
Windows are shown via <img data-attr-src> (NOT an RCSS image() decorator) so the
kernel's surface-element input-back, click-to-focus, popup placement and box
readback -- all keyed off the <img> src -- work.
host-bin passes the config path + --rml-compositing (the latter selecting server-
side decorations) through to the extensions. tasks.md records the wave.
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The intermittent "Super needs several presses to open fuzzel" bug was a
layer-shell configure storm, not a keybinding issue. The per-surface commit
handler called arrange() on EVERY wl_surface commit, and arrange()
unconditionally calls wlr_scene_layer_surface_v1_configure, which in wlroots
0.20 emits a fresh configure each call. A client acking + applying its configure
re-entered the commit handler, producing an unbounded
configure -> ack_configure -> commit -> configure loop that overflowed the
client's 4 KiB connection buffer ("Data too big for buffer") and got it killed
mid-handshake. fuzzel therefore only displayed when the burst happened to flush
in time.
Fix: only re-arrange on the initial commit or a commit that changes a
layout-relevant field (current.committed != 0); a plain buffer/frame commit no
longer triggers a configure.
Also:
- ext-keybindings: tap-Super now defaults to a launcher TOGGLE
("pkill -x fuzzel || fuzzel") in both default_bindings() and the sample
unbox.toml — pressing Super while fuzzel is open closes it.
- ext-keybindings: a genuine Super press always re-arms a clean tap, so a
dropped Super release can no longer eat the next tap (robustness).
- tests: update default-command assertions; add a bounded-configure invariant
guard to the layer-shell client test.
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exports WAYLAND_DISPLAY
ext-keybindings (new core ext) reads unbox.toml: tap-Super spawns fuzzel,
Alt+Tab/Alt+Shift+Tab rotate focus across all toplevels, plus Alt+F1 and
Ctrl+Alt+Backspace (quit). ext-xdg-shell's hardcoded keybinds removed
(migrated to the toml).
Kernel setenv()s WAYLAND_DISPLAY at startup so extension-spawned clients
connect to unbox, not the launching session — fixes fuzzel "no monitors"
on the real seat.
build + build-asan green: third-party Mesa/EGL/DRM + vendored-RmlUi sanitizer
noise suppressed (suppressions/), our code stays leak-checked; a real
libwayland leak in the layer-shell client test fixed.
Harness: spawn-env + sanitizer-noise rules, diagnose-real-seat skill,
GLOSSARY keybinding/action/tap-binding. Real-seat verified on the CF-AX3.
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