@nyamatongwe can you please be more specific? I've tried to modify patch you mentioned above. I commented macros lines in `SetFractionalPositions` but it didn't give any affect.
There is actually more. I just now noticed that at my system Scintilla do antialiasing for same characters differently (for mono fonts). That's probably why I was annoyed with the font look. Here's comparison of geany (above) with gedit (below) with DejaVu Sans Mono and JetBrains Mono Regular. For `I` or `l` in case of Scintilla there are different "types" of antialiasing with different colors. With gedit (GtkSourceView) there is only one type of antialiasing for each character with same colors.  I expect the same characters to be displayed the same way.
Now I'm using terminus bold font and quite satisfied with it. However it is a bit "lazy" solution because there is no antialiasing involved at all. 😁