Stop adding an extra line to scrollable height as that led to cursor up/down movement bugs because different parts of the code disagreed on top line.
Stop adding an extra line to scrollable height as that led to cursor up/down
movement bugs because different parts of the code disagreed on top line.

rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror