The Scintilla editing component that Geany uses always starts with a line boundary at the top of the screen and shows lines down from there, which can leave a fractional line at the bottom that the cursor won't enter, or if you are lucky(?) and have the window an exact multiple of the line height the cursor can go right to the bottom.
Github switches the fractional line to the top of the screen if the cursor enters the last line and vice versa. This change would have to be made in Scintilla as Geany has no control over that.
Scintilla is a separate project and you can request it at their feature request [tracker](https://sourceforge.net/p/scintilla/feature-requests/).
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