[request] IDE: Preview: create a mask for a given image (make parts of image transparent)

[RaiMan]

follow-up on Github: https://github.com/RaiMan/SikuliX1/issues/433
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Hello,

Recently I investigate an image based automation tool based on CitraTest.
I was not so enthusiastic about it, however there was one feature I found pretty useful and user friendly

This related to masking

Link to short video:
https://drive.google.com/file/d/1nP-LFT2PuBB6vWG3LmBQ6EqcbHTLlaS7/view?usp=sharing

Basically, in the IDE there's a feature to create a mask on the image directly. No need to assign a different image.
It works as follows: In the image you try to find, you mark a rectangular area as to be used as mask.

I found it really useful with Input fields (like in the video): sometimes these contain default text or may contain any previously entered text...which could make it troublesome to find the image. In that case: mask the text area, and place the click spot on the masked area (as shown in the video)

Of course this can also be solved by searching for the image and then move n-pixels to the right and click....yes
But I think this would be a really nice feature if you want to quickly create an automation script and make it more accessible to anybody to do UI automation.

Regards,
Daniel