[marble] [Bug 441329] New: Marble Maps mobile app: "Vector OSM" map does not honor Plasma Mobile screen scaling, renders only in upper left corner

[Kevin Kofler]

https://bugs.kde.org/show_bug.cgi?id=441329

            Bug ID: 441329
           Summary: Marble Maps mobile app: "Vector OSM" map does not
                    honor Plasma Mobile screen scaling, renders only in
                    upper left corner
           Product: marble
           Version: Marble Maps 1.0 (Android)
          Platform: Manjaro
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: android
          Assignee: marble-bugs at kde.org
          Reporter: kevin.kofler at chello.at
  Target Milestone: ---

SUMMARY
I tried the Marble Maps mobile application on Plasma Mobile on my PinePhone.
(The latest I tried is from KDE Gear 21.08.0.) The application defaults to the
"Vector OSM" OpenStreetMap vector data renderer (and actually, I do not see any
way to switch to another map). Unfortunately, the rendering is broken (as
described below) due to mishandling screen scaling.

STEPS TO REPRODUCE
1. Get a PinePhone running Manjaro Plasma Mobile (or I presume this can also be
reproduced on any other Plasma Mobile distro).
2. Run Discover and install Marble Maps.
3. Run Marble Maps from the menu.
4. Look at what gets rendered. Also notice how moving around the map does not
resolve the issue.

(Note that I was unable to reproduce this on my desktop computer using desktop
Marble and manually setting QT_SCALE_FACTOR=2.)

OBSERVED RESULT
The screen scaling factor (which defaults to 2.00× on the PinePhone) appears to
be ignored: The map rendering only fills the upper left quarter of the canvas.
(And there is no clipping, so larger features can end up drawing into the
unused remainder of the canvas.)

EXPECTED RESULT
The map rendering fills the entire canvas, either by being scaled to twice the
size, or by just drawing more of the map.

SOFTWARE/OS VERSIONS
Windows: no
macOS: no
Linux/KDE Plasma: Manjaro-ARM (Plasma Mobile edition)
KDE Plasma Version: 5.22.4
KDE Frameworks Version: 5.85.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION
I filed this against the "android" component because this is with the mobile
Kirigami Marble Maps app originally developed for Android. But I am running
Plasma Mobile, not Android.

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