[kde] [Bug 408591] New: slow QMessageBox

[Narut]

https://bugs.kde.org/show_bug.cgi?id=408591

            Bug ID: 408591
           Summary: slow QMessageBox
           Product: kde
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: narut.se at gmail.com
  Target Milestone: ---

Created attachment 120808
  --> https://bugs.kde.org/attachment.cgi?id=120808&action=edit
Slow QMessageBox in Kwrite

SUMMARY
QMessageBox is slow for the first pop-up. For example, the message box asking
for confirmation to empty trash, the message box asking to close KWrite when
there are unsaved changes. Note that if I cancel and try to trigger the message
box again shortly, it's not slow the second time.

STEPS TO REPRODUCE
For KWrite:
1. Freshly Launch KWrite
2. Type something in.
3. Close KWrite. The popup message box is slow.

For Trash:
1. Restart computer with something in Trash.
2. Try to Empty Trash. Confirmatory message box is slow.

OBSERVED RESULT
My computer seems to stop responding for a while during the launch of
QMessageBox (for example, sound pauses). Screenshot Attached.

EXPECTED RESULT
QMessageBox launches at normal speed.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: KDE Neon (Ubuntu 18.04)
(available in About System)
KDE Plasma Version: 5.16.0
KDE Frameworks Version: 5.59.0
Qt Version: 5.12.3

ADDITIONAL INFORMATION
I noticed this issue after a recent (KDE Neon) update.

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