--- redmine_old/public/javascripts/context_menu.js	2017-10-16 01:00:00.000000000 +0500
+++ redmine_new/public/javascripts/context_menu.js	2017-11-29 15:56:31.674827000 +0500
@@ -85,6 +85,9 @@
 }
 
 function contextMenuShow(event) {
+  var $wrapper = $("div#main");
+  var wrapper_height = $wrapper.height();
+  
   var mouse_x = event.pageX;
   var mouse_y = event.pageY;  
   var mouse_y_c = event.clientY;  
@@ -115,11 +118,14 @@
       menu_height = $('#context-menu').height();
       max_width = mouse_x + 2*menu_width;
       max_height = mouse_y_c + menu_height;
-
+      
       var ws = window_size();
       window_width = ws.width;
       window_height = ws.height;
-
+      
+      if (window_height > wrapper_height){
+        window_height = wrapper_height
+      }
       /* display the menu above and/or to the left of the click if needed */
       if (max_width > window_width) {
        render_x -= menu_width;