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

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

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.

Keith

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> Date: [11-28-2018 13:31:09] <28 Nov 2018 21:31:09 +0000>
> From: Alan Third <alan@idiocy.org>
> To: Keith David Bershatsky <esq@lawlist.com>
> Cc: emacs-devel@gnu.org
> 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