Let a new window pick its own size instead of forcing a guessed placeholder

Root-caused "windows spawn small and square, not remembering placement or
size": new_managed_window hardcoded a fresh toplevel's geometry to 800x632
before the client had said anything about its own preferred size, and
sync_geometry forced that guess onto the client's very first
xdg_toplevel::configure unconditionally. Per xdg-shell, size: None on that
first configure is how every mainstream compositor lets a client pick its
own natural size instead; this one never did, so every app converged on
the same placeholder rectangle regardless of what it would have chosen.

Window::size_is_provisional marks a size that really was just the guess
(not a remembered geometry, a rule's explicit geometry action, or a
maximize/phone-mode fill, none of which are guesses). sync_geometry sends
size: None for such a window's first configure; a new adopt_provisional_size,
called from the commit handler, adopts the client's own real first size
into Window::geometry the moment it commits one, clamping only position so
a bigger-than-guessed window can't hang off its monitor's edge.

Live-verified in a nested compositor: a zenity dialog now renders at its
own compact natural size instead of being stretched to the old guess.

1 files changed, 2 insertions, 0 deletions

diff --git a/crates/core/src/manager/mod.rs b/crates/core/src/manager/mod.rs
index e4ac1c2..d449486 100644
--- a/crates/core/src/manager/mod.rs
+++ b/crates/core/src/manager/mod.rs
@@ -3,6 +3,8 @@ use crate::layout::{Layout, MasterStackLayout, NoOpLayout, TilingConfig};
 use crate::monitor::{DisabledMonitor, Monitor, MonitorId, MonitorSplit};
 use crate::placement::{PlacementConfig, SmartPlacement, SnapZoneKind, MIN_WINDOW_HEIGHT, MIN_WINDOW_WIDTH};
 use crate::rules::WindowRule;
+#[cfg(test)]
+use crate::rules::{WindowMatch, WindowRuleActions};
 use crate::lock_config::LockConfig;
 use crate::theme::ThemeConfig;
 use crate::window::{likely_draws_own_titlebar, ResizeEdge, TitlebarHit, Window, WindowId, RESIZE_MARGIN};