As the upstream report refers to, Fitts law is the name for the principal violated. The upstream report also refers to the tab container as being a trigger. I can confirm this for Gnome Terminal - without tabs (a single term) the scroll bar is at screen edge when maximised, with 2 tabs the 1 pixel gap appears. Gedit always shows the tab control, even with only one document open. Hence the border is always there.
Attached is a screen shot to illustrate the problem.
As the upstream report refers to, Fitts law is the name for the principal violated. The upstream report also refers to the tab container as being a trigger. I can confirm this for Gnome Terminal - without tabs (a single term) the scroll bar is at screen edge when maximised, with 2 tabs the 1 pixel gap appears. Gedit always shows the tab control, even with only one document open. Hence the border is always there.
Attached is a screen shot to illustrate the problem.