pdf viewer no longer 'eats' keyboard input

apps/files_pdfviewer/js/pdfjs/viewer.js

@@ -1871,70 +1871,4 @@ window.addEventListener('DOMMouseScroll', function(evt) {
   }
 }, false);
 
-window.addEventListener('keydown', function keydown(evt) {
-  var handled = false;
-  var cmd = (evt.ctrlKey ? 1 : 0) |
-            (evt.altKey ? 2 : 0) |
-            (evt.shiftKey ? 4 : 0) |
-            (evt.metaKey ? 8 : 0);
-
-  // 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.
-    switch (evt.keyCode) {
-      case 61: // FF/Mac '='
-      case 107: // FF '+' and '='
-      case 187: // Chrome '+'
-        PDFView.zoomIn();
-        handled = true;
-        break;
-      case 109: // FF '-'
-      case 189: // Chrome '-'
-        PDFView.zoomOut();
-        handled = true;
-        break;
-      case 48: // '0'
-        PDFView.parseScale(kDefaultScale, true);
-        handled = true;
-        break;
-    }
-  }
 
-  if (handled) {
-    evt.preventDefault();
-    return;
-  }
-
-  // Some shortcuts should not get handled if a control/input element
-  // is selected.
-  var curElement = document.activeElement;
-  if (curElement && curElement.tagName == 'INPUT')
-    return;
-  var controlsElement = document.getElementById('controls');
-  while (curElement) {
-    if (curElement === controlsElement)
-      return; // ignoring if the 'controls' element is focused
-    curElement = curElement.parentNode;
-  }
-
-  if (cmd == 0) { // no control key pressed at all.
-    switch (evt.keyCode) {
-      case 37: // left arrow
-      case 75: // 'k'
-      case 80: // 'p'
-        PDFView.page--;
-        handled = true;
-        break;
-      case 39: // right arrow
-      case 74: // 'j'
-      case 78: // 'n'
-        PDFView.page++;
-        handled = true;
-        break;
-    }
-  }
-
-  if (handled) {
-    evt.preventDefault();
-  }
-});