Wishlist? Isn't that a bit low for a genuine bug, and an annoying one at
that?

I've noticed that in the low values of the line thickness control, for
simple shapes, the displayed value *is* continually updated. I think
it's related to the redraw speed of the shape that is being affected.

What appears to be happening while I hold down my mouse button is, for
each value increase:

1. increase value
2. repaint shape with new value
3. repaint spinner box

But this process is interrupted when the value is increased again
(apparently that happens asynchronously), and if it was still redrawing
the shape at that point the spinner box is never repainted and the
displayed value never updated. When the line thickness is low and the
shape simple, my PC can repaint the entire shape before the next value
increase, so the displayed value gets updated. If the shape is too
complex, or when the line becomes too thick, it takes too long to paint
the entire shape before the next value increase. I can actually see this
happening: while I'm increasing the line thickness, progressively less
and less of the shape gets repainted from top to bottom.

This could be as easy to fix as to make sure the spinner box is
repainted first, and *then* the affected shape.

-- 
Displayed value in spinner boxes not updated while changing
https://bugs.launchpad.net/bugs/553263
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