Measure tool should be able to create guides

[Alexandre Prokoudine]

GIMP's Measure tool has a very handy, albeit not very well known feature — creating guides at the end points of the measuring line. It would be handy to have the same feature in Inkscape. If Ctrl toggles rotation constraint, then Shift and Alt would switch between horizontal/vertical guides, and a combination of the two would produce a cross of guides.

This is a bit differently in GIMP where you can drag end points after you measured something, so after initial drawing Ctrl works there for creating horizontal guides, Alt produces vertical guides and a combination of Ctrl+Alt produces a cross of guides.

[su_v (suv-lp)]

> If Ctrl toggles rotation constraint, then Shift and Alt would
> switch between horizontal/vertical guides, and a combination
> of the two would produce a cross of guides.

The 'Shift' modifier is already taken (to reset the baseline for the measured angle - see bug #796459).

Do we need a blueprint for this tool, to coordinate the implementation of additional features?

[Jabiertxof (jabiertxof)]

I can do easy a button to create a guide whith the direction of the measure, other whith the direction of origin degree -changed whith SHIFT- and a vertical and horizontal one for end and start point of the measure.
I look arround this weekend.

[Jabiertxof (jabiertxof)]

Done in last commit