Add mouse window controls and finer display scaling (#63)

Add configurable mouse and wheel bindings, window move and resize, tab drops, cross-output dragging, and device settings. Adjust display scaling in 0.05 increments.

Preserve opposite-edge positioning during scrolling resizes and show rows for edge drops into tabbed columns.

compositor/src/render/scene.rs

@@ -232,7 +232,7 @@ fn scene_elements(
             presentation_alpha,
         ))
     };
-    let windows = if workspace.is_none() && state.overview.is_active() {
+    let mut windows = if workspace.is_none() && state.overview.is_active() {
         state
             .windows
             .overview_windows()
@@ -258,6 +258,16 @@ fn scene_elements(
             .collect::<Vec<_>>()
     };
 
+    if let Some(operation) = state
+        .pointer_operation
+        .as_ref()
+        .filter(|operation| operation.visual.is_some())
+        && let Some(index) = windows.iter().position(|(_, id, ..)| *id == operation.id)
+    {
+        // A dragged tile stays above floating windows, even after a relayout.
+        windows[..=index].rotate_right(1);
+    }
+
     let mut closing = if workspace.is_some() {
         Default::default()
     } else {