Can't override class name imgFullHeight of component GridListTile

[KevinAsher]

• I have searched the issues of this repository and believe that this is not a duplicate.

Current Behavior

When overriding the class name imgFullHeight via classes property injection (according to the docs here) an error occurs:

InvalidCharacterError
Failed to execute 'add' on 'DOMTokenList': The token provided ('MuiGridListTile-imgFullHeight-558 TitlebarGridList-buggyClass-554') contains HTML space characters, which are not valid in tokens.

Steps to Reproduce

The sandbox is a copy-pasta from the demo of the docs, with an added class called buggyClass

Your Environment

Tech	Version
Material-UI	1.0.0-beta.26
React	16.2.0
browser	Chrome 63.0.3239.132

[oliviertassinari]

@KevinAsher Thanks for raising the issue. It can be fixed with the following diff:

    if (
      imgElement.width / imgElement.height >
      imgElement.parentNode.offsetWidth / imgElement.parentNode.offsetHeight
    ) {
-     imgElement.classList.remove(this.props.classes.imgFullWidth);
-     imgElement.classList.add(this.props.classes.imgFullHeight);
+     imgElement.classList.remove(...this.props.classes.imgFullWidth.split(' '));
+     imgElement.classList.add(...this.props.classes.imgFullHeight.split(' '));
    } else {
-     imgElement.classList.remove(this.props.classes.imgFullHeight);
-     imgElement.classList.add(this.props.classes.imgFullWidth);
+     imgElement.classList.remove(...this.props.classes.imgFullHeight.split(' '));
+     imgElement.classList.add(...this.props.classes.imgFullWidth.split(' '));
    }

Do you want to submit a pull-request?