[Feature] Move polygon's z-index to top when clicked, so points overlapping with another polygon can easily be moved.

[armenforget]

Is your feature request related to a problem? Please describe.
When drawing to overlapping polygons, some points of one polygon may be placed underneath another. Depending on the z-index of the polygons, the points that are "underneath" the other polygon cannot be selected to move them.

Describe the solution you'd like
I would like all points of a polygon to be "selected", i.e. placed at a higher z-index, when I click on the polygon's background or any of its points in Edit mode. Then I can click the points that overlap with the other polygon to move them.

Describe alternatives you've considered
The current approach is to hide the polygon with higher z-index by unchecking it in the Polygon Labels panel. The lower z-index polygon's points can then be adjusted. Then the higher z-index polygon can be made visible again. This can be time consuming if there are many slightly overlapping objects, like a bowl of apples for example.