pub fn parse_shortcut(s: &str) -> Option<char>Expand description
The letter of a macro shortcut: "Ctrl+Shift+M", "Cmd+Shift+M", "⌘⇧M" and "m" all give
'M'. None when it is not one letter from A to Z, alone or after Ctrl+Shift (Cmd+Shift):
other modifiers ("Ctrl+Alt+M") are refused rather than read as Ctrl+Shift.