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Description
When drawing photo sketches using the tap-to-draw method (tapping on the screen to place points, with lines created automatically between them), each time the user selects a new colour, all previously drawn strokes change to the newly selected colour. This issue does not occur when drawing freehand directly with a finger — in that case the colour is correctly preserved per stroke. Only the tap-to-draw method is affected.
Open a feature form and attach a photo from the camera or gallery.
Tap the photo sketches icon to open the sketching toolbar.
Select a colour (e.g. blue).
Tap on one location on the photo, then tap on another location approximately 2 cm away — a line is automatically created between the two points in blue.
Select a different colour (e.g. green).
Tap on a new location to create another line segment.
Observe the colour of the previously drawn blue line.
Actual results
After selecting green and drawing a new tap-to-draw stroke, the previously drawn blue stroke changes colour to green. The entire sketch geometry adopts the most recently selected colour. Previously drawn strokes do not retain their original colour when using the tap-to-draw method.
Expected results
Each stroke should retain the colour selected at the time it was drawn, regardless of the drawing method used. Changing the colour for a new stroke should not affect any previously drawn strokes.
Note
When drawing freehand with a finger, the colour is correctly preserved per stroke — the issue is specific to the tap-to-draw interaction method.
Screenshots or logs
Screen_Recording_20260720_130556.mp4
Conclusion Created by Claude and supervised by a human test analyst.
Description
When drawing photo sketches using the tap-to-draw method (tapping on the screen to place points, with lines created automatically between them), each time the user selects a new colour, all previously drawn strokes change to the newly selected colour. This issue does not occur when drawing freehand directly with a finger — in that case the colour is correctly preserved per stroke. Only the tap-to-draw method is affected.
Environment
[x] Staging
Application (+ app version, build, operating system)
Mergin Maps Mobile App
Steps to reproduce
Actual results
After selecting green and drawing a new tap-to-draw stroke, the previously drawn blue stroke changes colour to green. The entire sketch geometry adopts the most recently selected colour. Previously drawn strokes do not retain their original colour when using the tap-to-draw method.
Expected results
Each stroke should retain the colour selected at the time it was drawn, regardless of the drawing method used. Changing the colour for a new stroke should not affect any previously drawn strokes.
Note
When drawing freehand with a finger, the colour is correctly preserved per stroke — the issue is specific to the tap-to-draw interaction method.
Screenshots or logs
Screen_Recording_20260720_130556.mp4
Conclusion
Created by Claude and supervised by a human test analyst.