Re: nsterm.m: How to prevent _inactive_ window update from overreaching.

[Keith David Bershatsky <esq@lawlist.com>]

Thank you, Alan, for pointing me in the right direction.

I will continue working on this project in my spare time.

Keith

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> Date: [11-22-2018 14:57:20] <22 Nov 2018 22:57:20 +0000>
> From: Alan Third <alan@idiocy.org>
> To: Keith David Bershatsky <esq@lawlist.com>
> Cc: Emacs Devel <emacs-devel@gnu.org>
> Subject: Re: nsterm.m: How to prevent _inactive_ window update from overreaching.
> 
> * * *
> 
> There are two (potential) issues here:
> 
>  1. Something is marking a large portion of the frame as dirty, and
> it's overflowing from the left window to the right, probably all the
> way to the right edge of the frame. That's almost certainly a call to
> ns_clip_to_rect.
> 
>  2. When the right window is marked as dirty it's failing to redraw
> completely. I'd assume what is happening is that the expose_frame
> functions (and its descendants) don't notice that the crosshair needs
> to be redrawn. I'm unsure how that side of it works, something must
> have to compare the rectangle to be exposed with the contents of the
> frame and decide what needs redrawn.
> 
> IMHO both should be fixed. 1 because it's redrawing too much, and 2
> because there are other circumstances where part of your crosshair
> could be marked as dirty and therefore need redrawn.
> 
> --
> Alan Third