layout: End DnD gesture when toggling interactive move to floating

Effective behavior mostly unchanged (it would end on refresh()), but this was
failing the invariant checks.

src/layout/mod.rs

@@ -3358,6 +3358,11 @@ impl<W: LayoutElement> Layout<W> {
                         1.,
                         self.options.animations.window_movement.0,
                     );
+
+                    // Unlock the view on the workspaces.
+                    for ws in self.workspaces_mut() {
+                        ws.dnd_scroll_gesture_end();
+                    }
                 } else {
                     // Animate the tile back to semitransparent.
                     move_.tile.animate_alpha(

src/layout/tests.rs

@@ -2970,6 +2970,35 @@ fn add_window_next_to_only_interactively_moved_without_outputs() {
     check_ops(&ops);
 }
 
+#[test]
+fn interactive_move_toggle_floating_ends_dnd_gesture() {
+    let ops = [
+        Op::AddOutput(1),
+        Op::AddWindow {
+            params: TestWindowParams::new(2),
+        },
+        Op::InteractiveMoveBegin {
+            window: 2,
+            output_idx: 1,
+            px: 0.0,
+            py: 0.0,
+        },
+        Op::InteractiveMoveUpdate {
+            window: 2,
+            dx: 0.0,
+            dy: 3586.692842955048,
+            output_idx: 1,
+            px: 0.0,
+            py: 0.0,
+        },
+        Op::Refresh { is_active: false },
+        Op::ToggleWindowFloating { id: None },
+        Op::InteractiveMoveEnd { window: 2 },
+    ];
+
+    check_ops(&ops);
+}
+
 #[test]
 fn set_width_fixed_negative() {
     let ops = [