[Bug 50513] New: Major regression in v6: window jumps around when clicking tab in application

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=50513

            Bug ID: 50513
           Summary: Major regression in v6: window jumps around when
                    clicking tab in application
           Product: Wine
           Version: 6.0
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: P2
         Component: -unknown
          Assignee: wine-bugs at winehq.org
          Reporter: ddascalescu+wine at gmail.com
      Distribution: ---

Created attachment 69176
  --> https://bugs.winehq.org/attachment.cgi?id=69176
Weirdo window snapping/jumping when clicking tabs

I use wine pretty much solely for MyLifeOrganzed. That app is portable, and the
executable ran fine on my Ubuntu 20.4.

Now I've installed Mint 20.1, then wine 6, then ran the same MLO executable
again. Something bizarre happens: when I click on a tab in the app, its window
moves to a specific position and size. If I move or resize the window and click
one of the tabs, it moves back to that position. If I click elsewhere, this odd
behavior doesn't happen.

1. Download from https://www.mylifeorganized.net/todo-list-windows.shtml and
install
2. Launch the application. There should be two tabs at the top - "Outline" and
"To-Do".
3. Click among them while moving the window around.

I've run `sudo apt install --install-recommends winehq-devel`, but `wine
--version` still outputs `wine-6.0` just like stable. I can't really tell if
Devel is in effect.

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