With custom titlebar, menus work quite differently from before

[yume-chan]

Issue Type: Bug

Testing the new custom titlebar implementation (#51422)

1. I just opened this menu, the first item now has keyboard focus. It used to require a Down Arrow to focus the first item. I think the current behavior is also reasonable and acceptable, just want to ask if it's intended.

However there is another minor display issue: the keyboard focus ring is too small. It should warp around the whole menu item, but now only the label part.

2. Now I moved the keyboard focus to the second item, and hover my cursor on the first item. So now I have two focuses? I don't think a program should have a mouse focus and a keyboard focus simultaneously.

3. Click "File" to open the menu, then click on "File" again, the menu should dismiss. It works most time, only except when I "click" via tapping on my Surface Pro's touch pad. It will quickly dismiss and reopen the menu.

4. The check marks after the label look strange, why not display them in front of labels like most programs' menus?

[sbatten]

@yume-chan Thank you for your feedback. Though this issue was created very early, this item now exists broken up in several other issues. I am going to close this one for simplicity.

[sbatten]

dupe of #52929, #52911, #52913, #52933