Allow quickpick to be dismissed via mouse

[josephshin93]

• VSCode Version: 1.35.0
• OS Version: OS X Yosemite (Version 10.10.5)

Steps to Reproduce:

1. Open up Visual Studio Code and open up a folder that has been initialized to be a Git repository.
2. Click on the branch checkout button at the very bottom left of the window
   
3. A dropdown list of branches will appear, you cannot click on any other part of the application to try to close the dropdown list. It can only be closed by hitting the esc key.
   
   If I remember correctly, I encountered this issue with the command palate dropdown as well with a previous version of Visual Studio Code. It has been fixed and I can exit the command palate dropdown now by clicking away from the dropdown. I hoped to find an issue report for the past issue as it could be helper for the developers, unfortunately, I could not find an issue report on this topic.

Does this issue occur when all extensions are disabled?: Yes

[vscodebot]

(Experimental duplicate detection)
Thanks for submitting this issue. Please also check if it is already covered by an existing one, like:

• Issue reporter: use custom dropdown on Windows (#56978)
• Dropdown UI issue in Settings (#71133)

[gjsjohnmurray]

This appears to be an intentional change of behaviour that arrived in April. See #71355

[egamma]

// fyi @misolori another request for a close box

[AlexSZYDLO]

Can there be an option to disable this? I find very annoying that I have to press esc to close it...

[miguelsolorio]

This issue should account for all quickpick widgets (branch picker, recents, etc.) to be consistent. One idea is to add a dismiss button (x), but will need to be discussed with the team.

[miguelsolorio]

The original issue (branch picker not closing when clicking outside of the picker) is now fixed, see #82797 for details. Will be closing this one as a duplicate.

[gjsjohnmurray]

I think there's still a good case for adding a "dismiss" button to quickpicks.