[kmail2] [Bug 414955] New: KMail stops responding when preview pane active on Wayland-Plasma

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https://bugs.kde.org/show_bug.cgi?id=414955

            Bug ID: 414955
           Summary: KMail stops responding when preview pane active on
                    Wayland-Plasma
           Product: kmail2
           Version: unspecified
          Platform: Debian testing
                OS: Linux
            Status: REPORTED
          Severity: crash
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: pugorg at yahoo.de
  Target Milestone: ---

SUMMARY
KMail stops responding when preview pane active on Wayland-Plasma

STEPS TO REPRODUCE
Started kmail on wayland-plasma with active preview pane. The preview stays
black at the beginning. When e.g. hovering with the mouse over the preview,
clicking on a different email or changing the folder the whole kmail
software stops reacting and the title bar shows an unresponsive
notification. No crash notification.

When not interacting with the enabled preview pane the software stays
responsive, even the settings can be reached to disable preview, which makes
kmail work fine. EMail content can then be viewed in separately opened
windows by doubleclicking them. Disabling HTML preference does not help.

This problem does not happen with the preview pane disabled and in either
configuration on X-Window.

OBSERVED RESULT
KMail stops reacting.

EXPECTED RESULT
EMail is displayed

SOFTWARE/OS VERSIONS
Running Debian testing, KMail 19.08.3 and 19.08.3
KDE Frameworks Version: 5.62.0
Qt Version: 5.12.5

ADDITIONAL INFORMATION

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