Subject: bug#16514: 24.3.50; Region overlay looks bad on refined hunks in diff-mode

From: Dmitry Gutov <[email-masked]>
Date: Sun, 6 Dec 2020 21:34:44 +0200

On 06.12.2020 17:58, Eli Zaretskii wrote:
>> From: Kévin Le Gouguec<[email-masked]>
>> Date: Sun, 06 Dec 2020 16:39:04 +0100
>> Cc:[email-masked], Dmitry Gutov<[email-masked]>
>>
>> As long as point does not go past the refinement (before the comma), the
>> region's background has the region face's background.
>>
>> Once point moves past the refinement, only non-refined parts keep the
>> region face's background; refined parts keep the refinement background.
> This is expected, since we sort overlays so that the one whose extent
> is larger wins.
> 
> To do anything else the overlays should have priorities.

So it's probably correct from the low-level primitives POV.

But is this a good UI? And shouldn't we maybe tweak the high-level 
implementation (perhaps, the way how the refinements are applied) so 
that the behavior is better?