fix(wm): avoid workspace load on cross monitor moves

This commit replaces the `window_manager.focus_workspace` call with a
`monitor.focus_workspace` which doesn't load the workspace. There is no
need to load the workspace when moving windows across monitors since
those workspaces will already be loaded, we simply need to update them.
Loading the workspace would cause some issues as well, like when moving
a window to a floating workspace which already contained a window that
matched some `floating_windows` rules was always putting the
"floating_window" on top of the window we just moved with a bunch of
focus flickering. This is fixed with this commit.

komorebi/src/process_event.rs

@@ -585,11 +585,19 @@ impl WindowManager {
                                 // so that we don't have ghost tiles until we force an interaction on
                                 // the origin monitor's focused workspace
                                 self.focus_monitor(origin_monitor_idx)?;
-                                self.focus_workspace(origin_workspace_idx)?;
+                                let origin_monitor = self
+                                    .monitors_mut()
+                                    .get_mut(origin_monitor_idx)
+                                    .ok_or_else(|| anyhow!("there is no monitor at this idx"))?;
+                                origin_monitor.focus_workspace(origin_workspace_idx)?;
                                 self.update_focused_workspace(false, false)?;
 
                                 self.focus_monitor(target_monitor_idx)?;
-                                self.focus_workspace(target_workspace_idx)?;
+                                let target_monitor = self
+                                    .monitors_mut()
+                                    .get_mut(target_monitor_idx)
+                                    .ok_or_else(|| anyhow!("there is no monitor at this idx"))?;
+                                target_monitor.focus_workspace(target_workspace_idx)?;
                                 self.update_focused_workspace(false, false)?;
 
                                 // Make sure to give focus to the moved window again