tweaks: reshuffle a condition, for compacter code

src/text.c

@@ -2129,14 +2129,12 @@ void do_justify(bool full_justify)
 
 	add_undo(COUPLE_END, "justification");
 
-	/* If we justified marked text, restore mark or cursor position. */
+	/* After justifying a backward-marked text, swap mark and cursor. */
-	if (openfile->mark) {
+	if (openfile->mark && !right_side_up) {
-		if (!right_side_up) {
+		openfile->mark = openfile->current;
-			openfile->mark = openfile->current;
+		openfile->mark_x = openfile->current_x;
-			openfile->mark_x = openfile->current_x;
+		openfile->current = line_from_number(was_top_lineno);
-			openfile->current = line_from_number(was_top_lineno);
+		openfile->current_x = was_top_x;
-			openfile->current_x = was_top_x;
-		}
 		update_undo(COUPLE_END);
 	}
 #endif