Add workaround to remove blank space after keyboard closes

[Withalion]

fixes #4692

The issue has been reported to Qt in QTBUG-145416. This is a workaround, which closes the blank space with some delay (in ms)

[github-actions]

Coverage Report for CI Build 36481262572

Coverage decreased (-0.006%) to 59.508%

Details

• Coverage decreased (-0.006%) from the base build.
• Patch coverage: No coverable lines changed in this PR.
• 1 coverage regression across 1 file.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

1 previously-covered line in 1 file lost coverage.

File	Lines Losing Coverage	Coverage
mm/app/layerfeaturesmodel.cpp	1	81.77%

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Coverage Stats

Relevant Lines:	15734
Covered Lines:	9363
Line Coverage:	59.51%
Coverage Strength:	94.12 hits per line

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💛 - Coveralls

[github-actions]

📦 Build Artifacts Ready

OS	Status	Build	Info	Workflow run
macOS Build	📬	Mergin Maps 73411 dmg	Expires: 27/12/2026	#7341
linux Build	📬	Mergin Maps 73671 x86_64	Expires: 27/12/2026	#7367
win64 Build	📬	Mergin Maps 65431 win64	Expires: 27/12/2026	#6543
Android Build	📬	Mergin Maps 865311 APK [armeabi-v7a]	Expires: 27/12/2026	#8653
	📬		Google Play Store	#8653
Android Build	📬	Mergin Maps 865351 APK [arm64-v8a]	Expires: 27/12/2026	#8653
	📬		Google Play Store	#8653
iOS Build	📬		Build number: 26.09.959311	#9593

[tomasMizera]

Thanks @Withalion. This needs some good testing on various Android versions and devices (@IvaKuklica)

[IvaKuklica]

Testing note:

✅ Verified — original issue no longer reproduces across devices.
The app now works correctly on all tested devices — no freezing, no half-rendered screens, layout draws fully without needing extra interaction:

Physical devices:
Samsung SM-X300, Android 16
Samsung Galaxy Tab S3, Android 9
Samsung Galaxy A53, Android 16

Virtual devices (Samsung Remote Test Lab):
Samsung Galaxy A54, Android 15
Samsung Galaxy A25, Android 16