text: do not check for <Tab> + mark while getting input but in do_tab()

This allows a {tab} in a string bind to indent a marked region.

This fixes https://savannah.gnu.org/bugs/?65859.

Problem existed since version 7.0, since braced function names
were introduced.

src/text.c

@@ -57,6 +57,13 @@ void do_mark(void)
  * of spaces that a tab would normally take up at this position. */
 void do_tab(void)
 {
+#ifndef NANO_TINY
+	/* When <Tab> is pressed while a region is marked, indent the region. */
+	if (openfile->mark && openfile->mark != openfile->current &&
+							currmenu == MMAIN && !bracketed_paste)
+		do_indent();
+	else
+#endif
 #ifdef ENABLE_COLOR
 	if (openfile->syntax && openfile->syntax->tabstring)
 		inject(openfile->syntax->tabstring, strlen(openfile->syntax->tabstring));

src/winio.c

@@ -1261,13 +1261,6 @@ int parse_kbinput(WINDOW *frame)
 	}
 #endif /* __linux__ */
 
-#ifndef NANO_TINY
-	/* When <Tab> is pressed while the mark is on, do an indent. */
-	if (keycode == '\t' && openfile->mark && currmenu == MMAIN &&
-				!bracketed_paste && openfile->mark != openfile->current)
-		return INDENT_KEY;
-#endif
-
 	/* Spurious codes from VTE -- see https://sv.gnu.org/bugs/?64578. */
 	if (keycode == mousefocusin || keycode == mousefocusout)
 		return ERR;