Fix window memory never saving on close, and split-screen icon/primary bugs

Screenshotted the just-split display on request rather than guessing --
it showed why windows never seem to remember placement/size, plus two
real split-screen bugs.

Window memory (WindowManager::remembered_geometry) was correctly wired
on the read side, but the only writes came from end_drag/end_resize in
dragresize.rs - a real drag or resize. A window the user opens, looks
at, and closes without ever touching its edges had nothing recorded, so
reopening it always fell back to a fresh cascade placement, for what is
probably most ordinary window lifecycles. remove_window now also
snapshots geometry (same app_id-non-empty gate the drag/resize sites
use), persisted at both of its wayland-side call sites the same way the
drag/resize-release site already does.

desktop_icon_origins mirrored the full icon set onto every Monitor entry
when general.desktop_icons_all_monitors is on - which, after a
srd.monitor.split, is one entry per split part of the same physical
screen, not one per real monitor. Extracted into a separately-tested
icon_origins_for that collapses split parts of the same connector back
to one origin, keeping a genuinely separate monitor's own origin intact.

Found while fixing that: every split part also reported primary: true
(computed from the connector's name, which doesn't vary per part) --
fixed by gating on part == 0 too.

1 files changed, 5 insertions, 0 deletions

diff --git a/crates/wayland/src/state/lifecycle.rs b/crates/wayland/src/state/lifecycle.rs
index 53a5e86..1749a3c 100644
--- a/crates/wayland/src/state/lifecycle.rs
+++ b/crates/wayland/src/state/lifecycle.rs
@@ -301,6 +301,11 @@ impl CompState {
             self.close_snap_flyout();
         }
         self.wm.borrow_mut().remove_window(id);
+        // Persists whatever `remove_window` just snapshotted into
+        // `remembered_geometry` - see that function's own doc comment for
+        // why a window closing, not just a manual drag/resize release,
+        // needs to reach disk too.
+        crate::window_memory::save_all(self.wm.borrow().all_remembered_geometry());
         self.pending.borrow_mut().push(CoreEvent::WindowDestroyed(id));
         foreign_toplevel::window_closed(self, id);
         // `remove_window` may have picked a new focused window on its own