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kartalJust small note: maybe it was in older versions but newest Notepad++ has nice custom colour styles feature which allows to select some text and apply 1 of 5 background colours to it (via RMB menu). They are temporary but this is a step into right direction
Take a look on screenshot (this one is real!):
Looking for a text editor that can colorize textYellow rectangle on 15th line gutter is something given by "Change Markers" plugin.
Together with user defined highlight it is starting to be powerfull:
Looking for a text editor that can colorize textEven "code folding" plays nice:
Looking for a text editor that can colorize text