main window add block mask, cm add keyboard block (#8640)

* block window body only so user can still click minisize button.
* cm doesn't show mask
* Remove focusable Offstage in tabbar_widget.dart

Signed-off-by: 21pages <sunboeasy@gmail.com>

flutter/lib/common.dart

@@ -2715,20 +2715,26 @@ Future<void> shouldBeBlocked(RxBool block, WhetherUseRemoteBlock? use) async {
 }
 
 typedef WhetherUseRemoteBlock = Future<bool> Function();
-Widget buildRemoteBlock({required Widget child, WhetherUseRemoteBlock? use}) {
-  var block = false.obs;
+Widget buildRemoteBlock(
+    {required Widget child,
+    required RxBool block,
+    required bool mask,
+    WhetherUseRemoteBlock? use}) {
   return Obx(() => MouseRegion(
         onEnter: (_) async {
           await shouldBeBlocked(block, use);
         },
         onExit: (event) => block.value = false,
         child: Stack(children: [
-          child,
-          Offstage(
-              offstage: !block.value,
-              child: Container(
-                color: Colors.black.withOpacity(0.5),
-              )),
+          // scope block tab
+          FocusScope(child: child, canRequestFocus: !block.value),
+          // mask block click, cm not block click and still use check_click_time to avoid block local click
+          if (mask)
+            Offstage(
+                offstage: !block.value,
+                child: Container(
+                  color: Colors.black.withOpacity(0.5),
+                )),
         ]),
       ));
 }