Add the possibility to define for what files/filetypes the plugin is enabled.
There should be the possibility to define for what files/filetypes the plugin is active. For example, one might want to see the lines in the Java and C++ editor, but not in the XML one.
I believe that the easiest option would be to have a list of regex expressions which are matched against the filename and maybe even project relative path. So one could create something like this:
Even though a little tough to configure, I believe that that would be quite nice. As alternative, a simple list of filenames might suffice:
java cpp xml
And so on.