fix: fix bug

Author: sjbur

packages/devextreme/js/__internal/scheduler/workspaces/m_work_space.ts

@@ -527,7 +527,13 @@ class SchedulerWorkSpace extends WidgetObserver {
   }
 
   _focusInHandler(e) {
-    if ($(e.target).is(this._focusTarget() as any) && this._isCellClick) {
+    const $target = $(e.target);
+    const $focusTarget = this._focusTarget();
+    // T1312256: On macOS, e.target can be a child element of the workspace root
+    const isTargetInsideWorkspace = $target.is($focusTarget)
+      || $target.closest($focusTarget).length > 0;
+
+    if (isTargetInsideWorkspace && this._isCellClick) {
       delete this._isCellClick;
       delete this._contextMenuHandled;
       // @ts-expect-error