Disable selection operations when skip effects are present or when selection contains the same pattern in more than one frame

[HertzDevil]

Consider a selection spanning across two adjacent frames:

Row	Note	Inst	Vol	fx1
2E	C-3			462
2F				D00
30-3F	...	...	...	...
00
01
02	D-3			464

• [ ] Drag paste (may move skip effects to other frames)
• [x] Interpolate (may overwrite effects in between)
• [x] Reverse (may move skip effects to other frames)
• [x] Expand (may move skip effects to other frames)
• [x] Shrink (may remove lines containing skip effects)

[HertzDevil]

done as selection condition; drag paste to be handled later