HandsOnTable Copy / Paste function does not work correctly in some browsers

Question

HandsOnTable Copy / Paste function does not work correctly in some browsers

The copy / paste function works correctly in Chrome and works poorly in Safari. I work on Mac OS (Maverick). The code uses Handsontable 0.11.4 and the ZeroClipboard plugin.

Operations that work in both browsers:

Copy and paste inside the grid using the context menu. Example:
- Select the content grid area, select Copy from the context menu, click the destination cell, and use Paste from the context menu.
Operations that use keyboard shortcuts for cutting or copying and context menus for pasting. Example:
- Select the grid area and use Cmd-C or Cmd-X, then select the destination cell and use paste in the context menu.

Operations that work in Chrome but not in Safari

Copy / paste between grid cells whenever Cmd-P is used. That is, in Safari (unlike Chrome), you cannot paste the selection copied from the grid back into some area of the grid using the Cmd-P keyboard shortcut.
Copy from another program (e.g. Excel or Sublime) to the grid. It works great in Chrome (using the Cmd-P or Paste menu option) and generally doesn't work in Safari. You cannot copy from an external program to Handsontable when working in Safari.

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CopyPasteClass.prototype.triggerPaste = function (event, str) {
  var that = this;
  if (that.pasteCallbacks) {
    setTimeout(function () {
      var val = (str || that.elTextarea.value).replace(/\n$/, ''); //remove trailing newline
      for (var i = 0, ilen = that.pasteCallbacks.length; i < ilen; i++) {
        that.pasteCallbacks[i](val, event);
      }
    }, 50);
  }
};