New subject: [Bug 52452] Tooltip handler for wrong dialog is invoked in OpenMPT

24 Jan 2022


      https://bugs.winehq.org/show_bug.cgi?id=52452
Bug ID: 52452
           Summary: Tooltip handler for wrong dialog is invoked in OpenMPT
           Product: Wine
           Version: 7.0
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: wine-bugs@winehq.org
          Reporter: wine@sagagames.de
      Distribution: ---
In OpenMPT (https://openmpt.org/) we use an MDI interface, and MDI windows are
split in half with a splitter inbetween. The two halfs are generated from two
separate dialog resources and thus events sent to one half should not influence
the other.
A user has reported a crash (https://bugs.openmpt.org/view.php?id=1553) that
happens when hovering certain controls in the lower half of one of these views,
and from the memory dump I can see that the hovering caused Wine to request
tooltip information from the upper half of the view rather than the lower half.
As the dialog item ID that was hovered didn't exist in the upper half of the
view, the app crashed with a null-pointer access. Trying to reproduce this
myself, I couldn't trigger the crash in Wine 7.0.0 (the user was on 7.0rc5-1)
but nevertheless I found that the tooltips don't work in the lower half of the
view, probably caused by the same issue that lead to the crash.
Reproduction steps:
1) File -> New -> IT to create a new document
2) You should now see the General Tab. You should be able to see various custom
tooltips when hovering items above the splitter.
3) Hovering items (e.g. the sliders) below the splitter should either lead to a
crash or not show any tooltip. On Windows, you would be seeing tooltips on
those sliders. Hovering the tab control right below the splitter caused a crash
for the user but it didn't for me.
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[Bug 52452] New: Tooltip handler for wrong dialog is invoked in OpenMPT