Tk Source Code

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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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.

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user_id=442968

I've seen this exact behaviour in Adobe Reader, v7.0.7.