Layer Icon Dragging & Modifier Press Behavior

[MorrowShore]

Dragging Behavior

This feature involves pressing (and holding) the layer icon in drawpile, then dragging it up or down to mass adjust visibility or potentially linking.

This behavior exists in Photoshop or CSP.

Various dragging implementations can be had, for example:
1- Dragging the layer text to mass select or deselect.
2- Dragging the layer icon to mass hide or unhide.
3- Dragging checkboxes (during transform) to mass select or deselect.

Modifier Press Behavior

This involves the keys shift, ctrl and alt.

In Krita, selecting a layer, then holding shift and pressing another layer, will select all layers between the two.
Whereas ctrl and click will deselect individual layers.

Another potential behavior would be to select individual layers while holding shift (rather than selecting everything in between).

The alt key + layer selection in Krita will hide everything except the layer selected.

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The implementation of this feature may change depending on #1382.