Merge pull request #2926 from yurydelendik/shift-zoom

Adds optional Shift for zoom keybindings

web/viewer.js

@@ -3306,7 +3306,8 @@ window.addEventListener('keydown', function keydown(evt) {
 
   // First, handle the key bindings that are independent whether an input
   // control is selected or not.
-  if (cmd == 1 || cmd == 8) { // either CTRL or META key.
+  if (cmd === 1 || cmd === 8 || cmd === 5 || cmd === 12) {
+    // either CTRL or META key with optional SHIFT.
     switch (evt.keyCode) {
       case 70:
         if (!PDFView.supportsIntegratedFind) {