[PATCH] Shortcut for deleting the last node in draw mode

[Cobra]

Especially when tracing from aerial imagery it happens sometimes that a node is placed where you do not want to have one. Instead of switching to select/delete or undoing and switching back to draw mode (and selecting the now last node) this could be done very fast by a shortcut. I propose backspace for this.

[stoecker]

Why don't you simply use "undo" functionality?

[Cobra]

I mentioned undo - this interrupts the drawing as well. One click is too much work!!111! ;)

Alternative: don't lose the dangling segment when undoing.

[xeen]

I can see the advantage of this, however backspace would only ever be useful in the very narrow case described above. What about instead undo not stopping the current draw action (=helper line visible) if possible. Undo/redo would never go into a draw action state if it was not active before. This would require tracking the last point of reference as well, though.

[skyper]

The follow line action has the undo action implemented that way (not working, yet -> #6367).

[akks]

I tried to add Backspace shortcut to Add mode. It undos last action and then selects last modified node.

Here is the patch...

[stoecker]

In [4611/josm]:

fix #6730 - patch by akks - add backspace in draw mode to undo last draw action