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

From: Keith David Bershatsky
Subject: Re: nsterm.m: How to prevent _inactive_ window update from overreaching.
Date: Wed, 28 Nov 2018 21:52:17 -0800

Thank you, Alan, for the additional pointers regarding how this issue may 
ultimately be resolved.  I will continue to think about and work on this in the 
coming days.

Yes, all three features (multiple fake cursors, crosshairs, and visible fill 
column) operate on the same principal.  There are similar functions for each 
feature, with the only main difference being that multiple fake cursors look 
for a particular buffer position when dumping the glyph matrix and looping 
through each row, whereas crosshairs and visible fill column look for a 
particular window relative X coordinate.

At this time, there is nothing fancy about multiple fake cursors -- i.e., Emacs 
only looks for a buffer position and creates a fake cursor with the desired 
cursor type and cursor color.  Magnar's Lisp library is still the only 
mechanism I am aware of that does the magic.  Instead of placing a visible 
overlay where fake cursors would ordinarily be created using Magnar's library, 
there are a few modifications to his Lisp functions that are contained within 
crosshairs.el.  From the list of fake cursor overlays created by Magnar's 
library, Emacs gathers the list of buffer positions and then draws built-in 
fake cursors that are within the confines of the visible windows.



> Date: [11-28-2018 13:31:09] <28 Nov 2018 21:31:09 +0000>
> From: Alan Third <address@hidden>
> To: Keith David Bershatsky <address@hidden>
> Cc: address@hidden
> Subject: Re: nsterm.m: How to prevent _inactive_ window update from 
> overreaching.
> * * *
> FWIW I asked about how the crosshair is drawn (since that was what you
> were discussing originally) but you only talked about multiple
> cursors. Am I to assume then that the crosshair drawing is tightly
> integrated with the multiple cursors?
> --
> Alan Third

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