Allow adding a new part to multipart geometries

[uclaros]

New feature for adding parts to multipart features.

Works with MultiPoint, MultiLineString and MultiPolygon layers.

The button is not available for singlepart layers.

[github-actions]

Coverage Report for CI Build 25923332422

Coverage increased (+0.1%) to 58.031%

Details

• Coverage increased (+0.1%) from the base build.
• Patch coverage: No coverable lines changed in this PR.
• 107 coverage regressions across 2 files.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

107 previously-covered lines in 2 files lost coverage.

File	Lines Losing Coverage	Coverage
mm/app/maptools/recordingmaptool.cpp	106	68.28%
mm/app/position/providers/simulatedpositionprovider.cpp	1	91.67%

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Coverage Stats

Relevant Lines:	15247
Covered Lines:	8848
Line Coverage:	58.03%
Coverage Strength:	100.8 hits per line

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💛 - Coveralls

[github-actions]

📦 Build Artifacts Ready

OS	Status	Build	Info	Workflow run
macOS Build	📬	Mergin Maps 68491 dmg	Expires: 13/08/2026	#6849
linux Build	📬	Mergin Maps 68671 x86_64	Expires: 13/08/2026	#6867
win64 Build	📬	Mergin Maps 60431 win64	Expires: 13/08/2026	#6043
Android Build	📬	Mergin Maps 815951 APK [arm64-v8a]	Expires: 13/08/2026	#8159
	📬	Mergin Maps 815951 APK [arm64-v8a]	Google Play Store	#8159
Android Build	📬	Mergin Maps 815911 APK [armeabi-v7a]	Expires: 13/08/2026	#8159
	📬	Mergin Maps 815911 APK [armeabi-v7a]	Google Play Store	#8159
iOS Build	❌	Build failed or not found.		#9101

[tomasMizera]

Looks good!

[tomasMizera]

@uclaros why not? :)

[tomasMizera]

I'm thinking View is a great state to add a new part

[uclaros]

The state is set to Record in qml before invoking this method. This is kind of a safeguard that the method doesn't get called properly.

Should I set the state in cpp and just call startDigitizingNewPart() from qml?

[Withalion]

Please rebase the PR on current master so the builds pass and run astyle to fix the formatting issue

[uclaros]

Suggested change

root.centerToPair( featurepair )

I think this is a bad idea and would like to remove it (also from split and redraw logic).
User is centered to the geometry when identifying it, then if he has panned the map he is re-centered a second time when tapping Edit geometry.
I think it is very probable that the user has already panned the map to where he wants to add the new part / split / redraw and we're just forcing him back to the original geometry location!

[IvaKuklica]

@uclaros
Comment for Add Part - New Feature for Multipart Geometry - Remove button incorrectly displayed as active when entering Add Part mode

Actual result:

1. When the user enters Add Part mode for all multipart geometry types feature via Edit → Edit Geometry → More → Add Part, the Remove button in the bottom toolbar is displayed as active even though no points have been added yet to the new part.

Expected result:

1. The Remove button should be inactive/disabled at this stage as there are no points to remove.
2. The issue is reproducible across all multipart geometry types: MultiPoint, MultiLineString and MultiPolygon layers.

Screen_Recording_20260610_152928.mp4