Change default annotation color (not #1126)
Problem
When I have night light turned on (in Gnome 3.38.3, Pop!_OS 20.10) at its maximum, the default color for annotations is completely invisible. (Hahaha, I was about to add some screenshots about the different scenarios, but the screenshots ignore night light.)
Therefore, to see this logical bug in action, you'll have to do it by yourself (just open a PDF, annotate something and look at its intense yellow. Then activate night light in the Settings app, with the slider all to the right).
(My) Solution
The simplest solution I imagine is to just change the default annotation color to another yellow (I am not very experienced in programming, so perhaps there is a better solution out there).
I tested a bit with the color palette to see which HEX color is the one that is visible when "extreme night light" is turned on and at the same time trying to modify the current one as little as possible:
"Our brain dispatch an alarm when our eyes look that fluorescent yellow mark over a lot of black characters." (Taken from a document talking about Evince's annotations.)
In the end, I concluded that the best and less noticeable change may be changing from #FFFF00 to #E0E000.
Please suggest any other possible solution, since maybe there is a better way to deal with this! For the moment, I'll (try to) build Evince and modify the code by myself.