Prevents scroll jump on iOS when using "data-clipboard-text"

Thanks to @geraldarthur at #369

dist/clipboard.js

@@ -240,9 +240,19 @@ function select(element) {
         selectedText = element.value;
     }
     else if (element.nodeName === 'INPUT' || element.nodeName === 'TEXTAREA') {
-        element.focus();
+        var isReadOnly = element.hasAttribute('readonly');
+
+        if (!isReadOnly) {
+            element.setAttribute('readonly', '');
+        }
+
+        element.select();
         element.setSelectionRange(0, element.value.length);
 
+        if (!isReadOnly) {
+            element.removeAttribute('readonly');
+        }
+
         selectedText = element.value;
     }
     else {
@@ -452,7 +462,6 @@ module.exports = E;
                 this.fakeElem.style[isRTL ? 'right' : 'left'] = '-9999px';
                 // Move element to the same position vertically
                 var yPosition = window.pageYOffset || document.documentElement.scrollTop;
-                this.fakeElem.addEventListener('focus', window.scrollTo(0, yPosition));
                 this.fakeElem.style.top = yPosition + 'px';
 
                 this.fakeElem.setAttribute('readonly', '');