[Bug 57720] New: Adobe Illustrator CS6 (16): Docking floating panels is practically impossible

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=57720

Bug ID: 57720
           Summary: Adobe Illustrator CS6 (16): Docking floating panels is
                    practically impossible
           Product: Wine
           Version: 10.0
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Reproduction:

1. Open Illustrator
2. Drag a docked panel so it becomes floating
3. Try to drag the floating panel back to the place where had been docked to
try to dock it

Expected: When dragging near a dockable edge, the application shows the
indicator that the panel can be docked, and when dropping the panel, it is
docked
Actual: When dragging near a dockable edge, the dockable indicator will flash
for ~one frame and then disappear, and when dropping the panel, it is not
docked. If you get extremely lucky, eventually, if virtual desktop is used to
increase the chance of success and the stars align, the panel will finally dock

This problem exists regardless of whether or not virtual desktop is used, but
virtual desktop makes it less impossible to dock. Bug #57719 is related.

I do not know which subsystem to trace to try to understand why this is
happening. Please let me know what additional information I can provide.