Error occur when clicking svg tags

[suntt2019]

The error output is:

TypeError: resizer.className.match is not a function
   at VueComponent.onMouseDown (multipane.js?77e5:41)

The error happens in this line:

vue-multipane/src/multipane.js

Line 40 in d9a17be

if (resizer.className && resizer.className.match('multipane-resizer')) {

The resizer.className here is expected to be a string, however, when click a svg tag, the classname returned is a SVGAnimatedString object. SVGAnimatedString objects don't implement the match method, so a error is thrown.

To fix this bug, a simple way is changing resizer.className into (resizer.className + ""), this will turn the SVGAnimatedString objects into null, and no error occurs in my environment.

[suntt2019]

Sorry, duplicate issue here, please refer to #6, #19.