bindings: remove the More-Space toggle entirely

It is so unlikely that a user will want to bind it that it
just clutters the help text (and the documentation).

doc/nano.texi

@@ -1377,9 +1377,6 @@ Toggles the presence of the two-line list of key bindings at the bottom of the s
 Toggles the constant display of the current line, column, and character positions.
 (The form @code{constupdate} is deprecated.)
 
-@item morespace
-Toggles the presence of the blank line that 'separates' the title bar from the file text.
-
 @item smoothscroll
 Toggles smooth scrolling (when moving around with the arrow keys).
 

doc/nanorc.5

@@ -740,9 +740,6 @@ Toggles the presence of the two-line list of key bindings at the bottom of the s
 Toggles the constant display of the current line, column, and character positions.
 (The form 'constupdate' is deprecated.)
 .TP
-.B morespace
-Toggles the presence of the blank line that 'separates' the title bar from the file text.
-.TP
 .B smoothscroll
 Toggles smooth scrolling (when moving around with the arrow keys).
 .TP

src/global.c

@@ -1234,7 +1234,6 @@ void shortcut_init(void)
 	/* Group of "Appearance" toggles. */
 	add_to_sclist(MMAIN, "M-X", 0, do_toggle_void, NO_HELP);
 	add_to_sclist(MMAIN, "M-C", 0, do_toggle_void, CONSTANT_SHOW);
-	add_to_sclist(MMAIN, "", 0, do_toggle_void, MORE_SPACE);
 	add_to_sclist(MMAIN, "M-S", 0, do_toggle_void, SMOOTH_SCROLL);
 	add_to_sclist(MMAIN, "M-$", 0, do_toggle_void, SOFTWRAP);
 #ifdef ENABLE_LINENUMBERS
@@ -1389,8 +1388,6 @@ const char *flagtostr(int flag)
 			return N_("Help mode");
 		case CONSTANT_SHOW:
 			return N_("Constant cursor position display");
-		case MORE_SPACE:
-			return N_("Use of one more line for editing");
 		case SMOOTH_SCROLL:
 			return N_("Smooth scrolling");
 		case SOFTWRAP:
@@ -1644,8 +1641,6 @@ sc *strtosc(const char *input)
 		else if (!strcasecmp(input, "constantshow") ||
 				 !strcasecmp(input, "constupdate"))  /* Deprecated.  Remove end of 2018. */
 			s->toggle = CONSTANT_SHOW;
-		else if (!strcasecmp(input, "morespace"))
-			s->toggle = MORE_SPACE;
 		else if (!strcasecmp(input, "smoothscroll"))
 			s->toggle = SMOOTH_SCROLL;
 		else if (!strcasecmp(input, "softwrap"))

src/nano.c

@@ -1391,7 +1391,6 @@ void do_toggle(int flag)
 			mouse_init();
 			break;
 #endif
-		case MORE_SPACE:
 		case NO_HELP:
 			window_init();
 			focusing = FALSE;