I think player area width increases with size of the map (see second paragraph)
It makes the player area stupidly wide in a 6 rings game (so a minority of games): https://ti4.westaddisonheavyindustries.com/game/pbd2918
Thus it's hard to look at the right side values and know whose player they are
Maybe the width could be fixed (or adjusted to content of player area, instead of map width), and also centred idk?
if I'm correct:
in MapGenerator.java
g2.drawRect(realX - 5, baseY, x + widthOfLine, y - baseY);
with:
mapWidth = (ringCount + 1) * 520 + EXTRA_X * 2;
width = mapWidth;
int widthOfLine = width - 50;