Allow moving guide lines while transform tool is active
Operating System: any
Description of the feature
When the transform tool (Shift+T) is active, you can "pull out" guide lines from the rulers. However you cannot reposition those guide lines without aborting the transform tool. If possible, there should be a way to move guide lines while the transform tool is active.
Use cases
When shooting rectangular objects with a mobile phone, those objects do not come out rectangular most of the time. The transform tool combined with a guide line for each side of the rectangle (marking the intended corners) is a great tool to to fix that. However, sometimes you want to move the guide lines to refine the adjustment before transforming (assuming that multiple transforms in sequence will make the image loose more details than for one single transform).