目录TabLayoutTabItem演示效果的XML TabLayout TabLayout 在开发中一般作为选项卡使用，常与 Viewpager2 和Fragment 结合起来使用。
I am using Qt Builder to create a simple window. I used the menu editor to add a menu. Now, I figured out how to connect one of the menu items to the close() method of the main window. My problem is
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