Re: [MACTCL] Minor bug in Tck/Tk 8.5.17: hidden widgets flicker on <Expose>

[Michiel de H. <mjl...@ya...>]

Hi Russell,

Can you provide a test script that demonstrates the flickering of hidden widgets?
This would help to establish what the exact cause of this behavior is.

Thanks,
-Michiel.

> I have a log window consisting of a Text widget, scroll bar, and various 
> widgets to control the display. Some of of the control widgets are 
> usually hidden, using grid.remove() to remove the parent frame of the 
> widgets.
> 
> With Tcl/Tk 8.5.17 on MacOS we see the hidden widgets briefly appear 
> whenever the main frame for this window receives an <Expose> event. 
> Unfortunately such an event occurs whenever a new item is appended to 
> the log (I'm not sure why). New lines can come in quite often, leading 
> to an annoying flicker of the hidden widgets.
> 
> Clearly this is merely a cosmetic annoyance. Nonetheless, I'm reporting 
> it and asking if anyone can suggest a reasonable workaround. The only 
> one I've thought of, so far, is to hide widgets using grid.forget 
> instead of grid.remove (I have not verified that works, but I'd be 
> amazed if it didn't). That's a bit of a nuisance because I'll have to 
> record the grid parameters, but it's certainly doable. If anyone has a 
> better idea I'd love to hear it.