#15 crash on deleting shape on different frame after selecting more shapes from previous frame

[Mj Mendoza IV]

to recreate:

1. draw 2 shapes on frame 1
2. draw 1 shape on frame 2
3. go back to frame 1
4. select all shapes (2 shapes as per step 1)
5. go to frame 2
6. press delete
7. expect crash

to fix:
when selecting another shape, un-select previously selected shapes from previous frame

NOTE: consider moving "selectedShapes" from Stage to Frame to retain selection from previous frame when user goes back

[Mj Mendoza IV]

Fixed at https://sourceforge.net/p/kage/code/734/

[Mj Mendoza IV]

Fixed at https://sourceforge.net/p/kage/code/734/