On the Leaflet Draw demo (https://leaflet.github.io/Leaflet.draw/docs/examples/full.html):
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Place a marker.
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Enter edit mode.
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Toggle "drawlayer" off/on in layer control.
- Result: Marker's red dotted border disappears while in edit mode.
- Exit edit mode (save/cancel).
- Result: Border reappears and stays visible.
- Re-enter edit mode.
- Result: Border hides again while in edit mode.