Fix issue where the arrow keys could cause us to go out of bounds.

diff --git a/www/js/remoteglot.js b/www/js/remoteglot.js
index 5ce7426b4f142e7105acdec50cb00d857168010b..cb38ebe91e5ea6413a236277effd25475e1d30c4 100644 (file)
--- a/www/js/remoteglot.js
+++ b/www/js/remoteglot.js
@@ -651,13 +651,17 @@ var show_line = function(line_num, move_num) {
 window['show_line'] = show_line;
 
 var prev_move = function() {
 window['show_line'] = show_line;
 
 var prev_move = function() {

-       --current_display_move;
+       if (current_display_move > 0) {
+               --current_display_move;
+       }

        update_displayed_line();
 }
 window['prev_move'] = prev_move;
 
 var next_move = function() {
        update_displayed_line();
 }
 window['prev_move'] = prev_move;
 
 var next_move = function() {

-       ++current_display_move;
+       if (current_display_line && current_display_move < current_display_line.pretty_pv.length - 1) {
+               ++current_display_move;
+       }

        update_displayed_line();
 }
 window['next_move'] = next_move;
        update_displayed_line();
 }
 window['next_move'] = next_move;