fix: add show state control in freezeMenu (#1184)

#1183

Author: hoongding

packages/core/src/extensions/SideMenu/SideMenuPlugin.ts

@@ -491,7 +491,11 @@ export class SideMenuProsemirrorPlugin<
    * attached to the same block regardless of which block is hovered by the
    * mouse cursor.
    */
-  freezeMenu = () => (this.view!.menuFrozen = true);
+  freezeMenu = () => {
+    this.view!.menuFrozen = true;
+    this.view!.state!.show = true;
+    this.view!.emitUpdate(this.view!.state!);
+  };
   /**
    * Unfreezes the side menu. When frozen, the side menu will stay
    * attached to the same block regardless of which block is hovered by the