bug#43381: 27.1.50; Maybe wrong cursor FG color in NS port

[Alan Third]

On Sun, Sep 13, 2020 at 03:02:02PM -0500, Dale Sedivec wrote:
> The Emacs manual says[1], "the text shown under the cursor is drawn using
> the frame’s background color."  However, on the NS port, the foreground
> for text under the cursor seems to be taken from the face at point
> rather than the frame's background color.
> 
> [1]: 
> https://www.gnu.org/software/emacs/manual/html_node/emacs/Cursor-Display.html
> 
> To illustrate this, start emacs -Q and eval:
> 
>     (progn
>       (switch-to-buffer (generate-new-buffer "test"))
>       (insert (propertize "testing"
>                           'face '((:background "blue" :foreground "white"))))
>       (goto-char 1))
> 
> You should be in a new buffer with some white-on-blue text.  Put point
> over any of that text and you should see the text under the default box
> cursor becomes (a hard-to-read) blue-on-black, taking the background
> color at point, rather than white-on-black, which it should be if it
> took the frame's background color.

The attached appears to fix it for me, however I'm not sure it's the
right fix. The X ports appear to have a much neater system for setting
the colours which may be worth emulating in the NS port.

-- 
Alan Third

0001-Fix-NS-cursor-colors-bug-43381.patch
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