Join / merge selective editing regions

[Krzysiu]

Sorry if that was already proposed, I did my best to search for it.

My proposition is to be able to merge multiple regions As you can see, it has three, overlapping regions. As they add exposure, they are adding each other, causing white "highlights" with draker regions. This one has less shadowy parts, but the white blobs are even more visible.

One more example, without lines, which shows IMO more clearly what's the problem:

I think this tool is too great to be constrained by two shapes.

What I propose is that (one of these, sorted from seemingly simplest to the most robust): 1) regions could be merged into one by simple text box with group name - shapes in single group woks as single region || 2) ability to create shape from beizer curves || 3) shapes could be imported SVG shape || 4) the same, but with changed logic - two level tree, where there's effect as 1st level and it can contain many 2nd level regions (see picture below)

[Lawrence37]

ability to create shape from beizer curves

See #5409.