One comment on sourceforge.net is:

I have seen this rarely. A possibility is that buffered drawing is on and that an error in the drawing code causes return to the by-line loop without any new drawing into the buffer bitmap. Then the previous line's image is drawn onto the new line. You could turn off buffered drawing (SCI_SETBUFFEREDDRAW) if it is on to check this - I don't know if Geany supports changing this setting.
Another possibility is that there is a bug in the line wrap positions so that the same subline is present twice.

Is there a possibility to turn off buffered drawing (SCI_SETBUFFEREDDRAW) in Geany?


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