The default keyboard shortcut for Split Nearest Line in the map editor is Ctrl-Shift-S which is also the key shortcut for Map Save As. If you press Ctrl-Shift-S in the map editor, it will split the nearest line and simultaneously open the Map Save As dialog. If you are just trying to split a line, this is inconvenient. If you are trying to save the map under a different name, you will probably not notice that you also split a line. Nothing is bound to Shift-S, so this changes the default binding for the Split Nearest Line action to Shift-S.
The default keyboard shortcut for Split Nearest Line in the map editor is Ctrl-Shift-S which is also the key shortcut for Map Save As. If you press Ctrl-Shift-S in the map editor, it will split the nearest line and simultaneously open the Map Save As dialog. If you are just trying to split a line, this is inconvenient. If you are trying to save the map under a different name, you will probably not notice that you also split a line. Nothing is bound to Shift-S, so this changes the default binding for the Split Nearest Line action to Shift-S.