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Earlier today I wrote that a nested compositor cannot produce a second
monitor because split and fake monitors "need real head machinery that only
the DRM backend has". That was inferred from both commands returning ok and
changing nothing, not read from the code, and the first half is false.
udev/platform.rs was simply the only backend draining those request queues.
The winit poll never took them off, so the request sat there forever and the
dispatch looked like it had worked. Nothing about split is DRM-bound:
MonitorSplit is bookkeeping in WindowManager and split_rect is pure geometry
in core. The winit poll now drains split requests the same way, and its
monitors() expands a split into one Monitor per part with its own
full_geometry and maximize_geometry, matching the udev expansion. Splitting
the nested output into two 640x800 monitors with a seam now works, which is
what a multi-monitor repro needs. Fake monitors stay udev-only; that half was
not re-checked and is not claimed either way.
Also corrected: the capture pass measured the shadow rect from w.geometry
while both on-screen loops measure it from effective_frame, the client's real
committed size. src indexes into a buffer rasterised at the frame's size, so
the two disagreeing reads the wrong region whenever a client settles on a
different size than it was asked for.
The seam check this was meant to unblock is still not done. With the split
working, the negative control failed: a floating window off the seam had no
shadow either. Running both clients in one instance showed Alacritty renders
a shadow in a capture and Nemo renders none, same settings, both floating,
either focus. Nemo is server-side decorated and Alacritty is not, which is a
lead and not a conclusion. Recorded in docs/TODO.md as open rather than
guessed at.
515 tests pass, clippy clean.
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XWayland stability, GPU rendering, and multi-cursor Phase 2
The bulk of a multi-session shift's real work landed in crates/wayland.
Full root-cause/verification narrative for every item below lives in
docs/TODO.md (each has its own dated entry); this is the summary:
Desktop shell:
- Real desktop icons v2 (state/desktop_icons.rs, desktop_icons.rs):
fixed origin-baked-before-the-bar-connects, fixed-icon sort order, and
a proper Rename/Delete-to-Trash menu (window_memory.rs backs the
rename-persistence side). Rubber-band marquee multi-select.
- icon_theme.rs: real freedesktop icon-theme lookup (inherits chain,
hicolor fallback) rendering actual theme SVGs via resvg/tiny-skia,
replacing the hand-drawn placeholder glyphs.
- Context/desktop menus (decoration.rs, desktop_menu.rs, state/menu.rs)
rebuilt to match the project's own AGS panel styling: rounded floating
panel, tinted-fill row highlight, real separators, a much fuller
titlebar window-menu action set.
Layer-shell / multi-monitor:
- Layer-shell hit-testing and render positioning (input/pointer.rs,
udev/render.rs's element placement) now correctly convert LayerMap's
logical geometry into physical pixels on a fractionally-scaled output
- root cause of a bottom-anchored dock being unclickable and
unpainted while a top-anchored bar on the same output worked.
udev/outputs.rs's relayout_outputs gained the same physical/logical
split for cross-output positioning, now backed by a real unit test
(next_logical_x) built from the original measured incident numbers.
- state/geometry.rs: a window's border/decoration no longer briefly
clips when moved between differently-scaled monitors mid-drag.
XWayland / stability:
- xwayland.rs, udev/session.rs, udev/platform.rs: fixed a 100%-
reproducible cold-start XKEYBOARD crash-loop (XWayland's own stdin
inherited a real, already-owned VT; env passthrough and idle-callback
spawn timing were both real, independent gaps) that had silently taken
down all X11-app support and the global-menu registrar every session.
- state/toplevel.rs, state/lifecycle.rs: XWayland dialog detection via
WM_TRANSIENT_FOR, not just a native xdg_toplevel parent.
Rendering:
- udev/render.rs, decoration.rs: real GPU (GBM+EGL+DrmCompositor)
window-content and cursor rendering on the udev backend, falling back
to the untouched Pixman path automatically on any init failure.
- decoration/tests.rs, state/mod.rs: rounded-corner/border fixes for
interactive resize lag and cross-monitor moves.
Multi-cursor Phase 2 (virtual_pointer.rs, new; state/mod.rs, udev/
platform.rs, winit/nested_platform.rs): pins a zwlr_virtual_pointer_
unstable_v1 object to a specific window, bypassing the shared seat/
focus/pointer_pos path entirely via hand-rolled wl_pointer.enter/motion/
button/frame/leave against every WlPointer the target client has bound
(PointerHandle::client_pointers). Lets an agent operate one window while
a human uses another, genuinely simultaneously, with zero client
cooperation and no second wl_seat (confirmed a dead end: real clients
only ever bind the first seat advertised).
Full workspace build/test/clippy clean.
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apply_geometry and restore - the Platform callbacks core's toggle_
maximize/apply_snap_zone/restore_window drive for a pure geometry
change - only called sync_geometry, never redraw_decoration_buffer.
The cached border-strip/titlebar bitmaps (self.border_top_decorations,
self.border_bottom_decorations, self.decorations) size themselves from
effective_frame, which can differ from w.geometry alone once a CSD
client's own invisible shadow margin is involved (see that function's
own doc comment) - but nothing here rebuilt them right when this
callback changed w.geometry. The next rebuild only happened whenever
this window's client next committed a frame or some other, unrelated
trigger reached redraw_decoration_buffer, not reliably right away.
Confirmed live: maximizing then restoring a Chrome window left its
border strips sized for the maximized frame while its real content had
already settled back to the smaller restored size, immediately and
permanently until some later trigger happened to catch it up - a
real, visible gap between content and border on the far (east/south)
edges, a different bug from the half-pixel corner seam fixed
separately in blend_corner_pixel.
Both apply_geometry and restore now also call redraw_decoration_buffer
right after sync_geometry, in both the udev and winit backends.
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Safety commit before reconciling this worktree with main, which has
diverged with its own separate fixes today. Nothing here is reviewed
or curated yet - this exists purely so none of this work can be lost
to a git operation, disk issue, or worktree cleanup while that
reconciliation happens.
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