[okular] [Bug 423360] New: Viewport blinks (flashes, disappears) while scrolling or dragging at moderate or high zoom levels

[David Hurka]

https://bugs.kde.org/show_bug.cgi?id=423360

            Bug ID: 423360
           Summary: Viewport blinks (flashes, disappears) while scrolling
                    or dragging at moderate or high zoom levels
           Product: okular
           Version: 1.10.1
          Platform: Compiled Sources
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: david.hurka at mailbox.org
  Target Milestone: ---

Created attachment 129583
  --> https://bugs.kde.org/attachment.cgi?id=129583&action=edit
Viewport flashing while scrolling with Trackpoint

SUMMARY
When I zoom far enough that not the whole page is visible at once, the viewport
repeatedly disappears briefly while dragging.

STEPS TO REPRODUCE
1. Zoom to a detail
2. Drag or scroll using a continuous scrolling device

OBSERVED RESULT
The page contents disappear briefly, see screencast

EXPECTED RESULT
Page is always shown, at least where it is already rendered

SOFTWARE/OS VERSIONS
KDE Neon 5.19
KDE Plasma Version: 5.19.1
KDE Frameworks Version: 5.71
Qt Version: 5.14.2

ADDITIONAL INFORMATION
Recently I noticed this bug, and I *think* it appeared only recently. IIRC it
looked better after compiling from v19.12.3. Unfortunately I couldn’t figure
out how to install an older version today.

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