dragging then removing guide causes undo problem

[Liam P. White]

Carried over from comment 7 of bug #1227193 (issue was unrelated)

1. start dragging out a guide from the ruler (don't drop it on the page)
2. drag it on or past the ruler to delete it
3. press undo (any undo method works, Edit menu, toolbar button and ctrl + z)
4. the terminal outputs:

** (inkscape:8556): WARNING **: Incomplete undo transaction:
** (inkscape:8556): WARNING **: Event: Set attribute showguides to "true" on #<Element:0x0x91bbef0>
** (inkscape:8556): WARNING **: Event: Set attribute inkscape:guide-bbox to "true" on #<Element:0x0x91bbef0>

[Liam P. White (liampwhite)]

Occurs because sp_dt_ruler_event modifies the document but as the guide is immediately deleted the change is never committed with DocumentUndo::done

[su_v (suv-lp)]

Reproduced with 0.47, 0.48.5 and current trunk r13502 on OS X 10.7.5.

[jazzynico (jazzynico)]

Also reproduced on Windows XP, Inkscape trunk revision 13502.