PR #376 added the possibility to set the font size of the Arabic area separately from the edit area. Then, with PR #379 changing the font size of each pane automatically updates the font size of the line numbers.
Now the issue is that when you change the font size of the edit area, the font size of the line numbers of the secondary edit area (the one you see when you split the screen) is not updated accordingly. This happens because there is nothing explicitly updating the font size of the secondary area after changing the settings.
PR #376 added the possibility to set the font size of the Arabic area separately from the edit area. Then, with PR #379 changing the font size of each pane automatically updates the font size of the line numbers.
Now the issue is that when you change the font size of the edit area, the font size of the line numbers of the secondary edit area (the one you see when you split the screen) is not updated accordingly. This happens because there is nothing explicitly updating the font size of the secondary area after changing the settings.