bug#51411: NS port cleanups

[Po Lu]

Alan Third <alan@idiocy.org> writes:

> NSRectClipList creates a union of the passed rectangles and then sets
> the clipping rectangle to that, so it contains all of them. That's
> useful because NSRectClip uses the intersection of the current
> clipping rectangle and the new one.
>
> Does DPSrectclip use the intersection? If so this may not work as
> intended and it might be better to union the rectangles ourselves.

It does intersect the rectangle with the current clipping.  I determined
that from a cursory examination of the source code, as the function
appeared in the documentation as documented, but no documentation was
actually written for it.

>> @@ -4195,13 +4091,88 @@ overwriting cursor (usually when cursor on a tab) */
>>  
>>    /* Draw box if not done already.  */
>>    if (!s->for_overlaps && !box_drawn_p && s->face->box != FACE_NO_BOX)
>> +    ns_dumpglyphs_box_or_relief (s);
>> +
>> +  ns_unfocus (s->f);

> You unfocus here, then continue working on the frame here. You either
> need to focus again or extend the original focus. Remember you can
> focus without setting the clipping, then save and reset the graphics
> state as required if you prefer.

Hmm.  Will this work better?  Thanks.

0001-Improve-font-display-on-NS-port.patch
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