Additional information - in both scenarios if you leave the gedit window open and get either Dolphin or Firefox to open a new file, you get two additional tabs on the existing gedit window - the file you requested and another "untitled document".
I've tried to see if I can reproduce this behavior by invoking gedit with the shell, but no matter what combination I tried I couldn't figure out what parameters can be used to trigger this behavior. When I reproduce this behavior using Dolphin or Firefox, the parameter list gedit's proc entry look normal.
Additional information - in both scenarios if you leave the gedit window open and get either Dolphin or Firefox to open a new file, you get two additional tabs on the existing gedit window - the file you requested and another "untitled document".
I've tried to see if I can reproduce this behavior by invoking gedit with the shell, but no matter what combination I tried I couldn't figure out what parameters can be used to trigger this behavior. When I reproduce this behavior using Dolphin or Firefox, the parameter list gedit's proc entry look normal.