fix: cannot drag on progress bar in IE9 (#4783)

fix #4773

src/js/utils/dom.js

@@ -8,6 +8,7 @@ import log from './log.js';
 import tsml from 'tsml';
 import {isObject} from './obj';
 import computedStyle from './computed-style';
+import * as browser from './browser';
 
 /**
  * Detect if a value is a string with any non-whitespace characters.
@@ -782,6 +783,12 @@ export function isSingleLeftClick(event) {
     return true;
   }
 
+  if (browser.IE_VERSION === 9) {
+    // Ignore IE9
+
+    return true;
+  }
+
   if (event.button !== 0 || event.buttons !== 1) {
     // This is the reason we have those if else block above
     // if any special case we can catch and let it slide