Fix Ctrl+Space key combination to emit CtrlSpace instead of Rune ' '

src/tui/tcell.go

@@ -396,6 +396,9 @@ func (r *FullscreenRenderer) GetChar() Event {
 			r := ev.Rune()
 
 			switch {
+			// translate native key events to ascii control characters
+			case r == ' ' && ctrl:
+				return Event{CtrlSpace, 0, nil}
 			// handle AltGr characters
 			case ctrlAlt:
 				return Event{Rune, r, nil} // dropping modifiers