All drag actions should be cancellable with Esc/RMB

[Keavon]

This issue tracks all drag actions that don't currently implement cancellation with Esc/right click. An example of this desired behavior is the Rectangle tool, which lets you draw a rectangle by dragging it and hit Esc or right click to cancel the action. Another example is the Select tool which lets you drag a layer around on the canvas and similarly cancel it to restore it to its pre-drag location.

• Select tool: moving the pivot (Allow cancellation of pivot drag in Select tool #1658)
• Artboard tool: resizing an artboard (Fix cancellation of drag actions in all tools where it's missing #1664)
• Artboard tool: drawing a new artboard (#1664)
• Navigate tool: zooming by click-dragging (#1664)
• Navigate tool: tilting by Alt-click-dragging (#1664)
• Fill tool: filling should be cancellable after Lmb is pressed but before it's released (Make the Fill tool's fill click operation cancellable #1666)
• Gradient tool: drawing a new (or replacement) gradient line (#1664)
• Gradient tool: reposition the endpoint of an existing gradient line (#1664)
• Path tool: moving an anchor/handle (or multiple), including the toggling with Alt between smooth/sharp that might have occurred during the drag (#1664)
• Freehand tool: drawing the trace, it should be canceled (#1664)
• Brush tool: drawing the trace, it should be canceled (#1664)

[milan-sedivy]

Hi Keavon, I would like to work on this (select-tool for now)

[milan-sedivy]

Currently done:

• Artboard tool
• Navigation tool

I'll probably do the rest today as well (having a more hectic day than anticipated).