https://bugs.kde.org/show_bug.cgi?id=495790
Bug ID: 495790
Summary: [Andoird] Auto-save on app minimization fails under
some curcumstances
Classification: Applications
Product: krita
Version: git master (please specify the git hash!)
Platform: Android
OS: Android 14.x
Status: REPORTED
Severity: major
Priority: NOR
Component: General
Assignee: krita-bugs-n...@kde.org
Reporter: dimul...@gmail.com
Target Milestone: ---
On Android the apps are supposed to sync the data to the persistent storage
on-the fly, so the system can close the app without any notification either
when too many apps are open or when the user swipes this app from the screen.
In Krita we don't have on-the-fly document storage, so we need to save the
document every time the user minimizes the app. That is why we have a special
foreground service named "DocumentSaverService" that is started every time
Krita app is minimized on Android. This service is supposed to auto-save the
document when the app is minimized.
This design sometimes doesn't work:
Case A. Switch app (autosaving works fine)
=========================
1) Open big document in Krita, draw something
2) Swipe to enter task switcher
3) Either switch to another app or tap to jump to the start screen
4) **After** the app is minimized or a task switched, the service is started
and the document is autosaved correctly
Case B. Close app from the task switcher (autosaving fails)
===============================================
1) Open big document in Krita, draw something
2) Swipe to enter task switcher
3) Swipe the app from the screen (effectively close the app)
4) When the app is closed by swiping, the service is not started and no
autosave is initiated
Case C. Switch app while Krita is busy (autosaving fails)
===============================================
1) Open big document in Krita, draw something
2) Start some very long operation (e.g. start gradient on a huge canvas)
3) Swipe to enter task switcher, switch to some other task (or tap to enter
start screen)
4) The service is started, **but** autosaving fails because the image is busy.
There will be no retries to save the data.
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