Don't draw the Handles while performing a transform.
The handles can get in the way when trying to use the transform on a small part of the drawing with some zoom out (e.g. trying to make transformations on an eye while viewing the entire face), since there's no reason to show the handles while performing a transformation it seemed like a good idea to not draw them in the meantime.
This raises a couple of questions that are better discussed here:
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Should this be done always or should there be a button to allow the handles to be shown/hidden while transforming?
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Should this happen only to the free transform or some others?
Personally I think that for the free transform is okay to always hide, but for perspective or other it might be ideal to show them, but maybe for consistency sake it should be a button on all of them? What do others think about this?
Also this is my first PR to Krita, so even if this is very small (for now) I would like to ask sorry in advance in case I broke some code style or anything, let me know so I can improve for the future. Thanks!