[1.3.0] Pattern select behaviour

[tilllt]

You are in pattern editor, you want to select a segment of the pattern using shift and cursor keys. You release the shift key, realise you forgot a few lines, press the shift key again to select more lines -> previous selection is gone.

Shift imo should always mean "add the the existing selection", no matter if you release it and press it again

https://youtu.be/r3Huxb_Fi24