Tab key snap point toggling, UI not updating while mouse pressed but stationary

[Cojnel]

While an object is being dragged,
one can see the snap point cycle between
it's available positions by pressing the Tab key.

When the object isn't being dragged anymore
(with the left mouse button still pressed),
if one presses the Tab key nothing changes visually,
but the snap point cycles in the background,
and as soon as the object is dragged again,
then the new snapping location is shown.

1. Preferences > Behavior > [checked] Only snap the node closest to the pointer
2. turn on cusp node snapping
3. draw a rectangle
4. hold down the left mouse button on the rectangle and move the shape slightly
(the tab key doesn't seam to work until a drag event has been initiated).
5. keep moving the mouse and press the Tab key to see the snap point cycling
through the corners of the rectangle,
(the pattern seams to differ depending on the corner closest to the cursor).
6. stop pressing the Tab key and stop moving the mouse
7. try not to move the mouse andpress the Tab key twice,
although nothing changes visually, the snap point has moved in the background.
8. when the cursor is moved again the snap points new location is shown.

What should happen:
It is probably more userfriendly if the snap point updates visually when
the mouse button is held down on an object and the tab key is pressed,
then one can pick the snap point before starting to drag the object.

Tested with:
r12852 on linux mint 15 cinnamon 32bit

[jazzynico (jazzynico)]

Reproduced on Windows XP, Inkscape trunk revision 12851.

[su_v (suv-lp)]

Reproduced with r12981 on OS X 10.7.5