Agree that the default selection highlighting can be a bit hard to see sometimes, but you can change it to be more visible in the colour scheme (or `filetypes.common` for the default).
At the moment Scintilla only allows one style for the number margin, so you would have to request the feature there first. --- Reply to this email directly or view it on GitHub: https://github.com/geany/geany/issues/805#issuecomment-164204796
