On m.s. windows the resize handles seem to have
a "hole" where they suddenly change back to the
original pointer (e.g. an arrow) as you move the mouse
over the left, right, or bottom edge (but strangely,
not the top edge - i.e. at the title). Also the
diagonal lower right corner.
To duplicate, simply run wish so you have the . window
open. No code needed. However, this occurs on all
toplevel windows.
Now, move the mouse left and right over the right hand
border.
You will see the cursor change to <--> then blink back
to the pointer, then the <--> a second time, then
finally back to the cursor. This happens on all tcl/tk
windows maybe 50% of the time.
This makes it difficult to grab hold of the windows
edge to resize it.
In all other windows apps (i.e. not tcl/tk), this does
not occur.
But tcl/tk seems to have a hole in the middle, where
it might be losing focus or something. Often if you
have the mouse positioned to resize, then press the
mouse button, the slight movement (say 1 pixel) is
enough to have the cursor change before you can "grab"
it.
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I've seen this exact behaviour in Adobe Reader, v7.0.7.
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This "twitchy" behavior does NOT happen on the top above
the titlebar.
It's been noticed that:
The twitching only occurs when moving outwards
from inside the window. But note the next comment:
One more data point: When running wish, with both
the console window and the blank toplevel window,
if you put the toplevel over the console (say in the
center of the console) and then move from the console
in towards the inside of toplevel, it again happens.
If the outer window is something else, say, notepad,
then it does not happen.