Bug Description:

Steps to Reproduce:

1. Open the application in a workspace with symbols (e.g. the Theia repo)
2. Open a code file so that there are some symbols to display.
3. Use the 'find symbol' shortcut (default: CtrlCmd+t)
4. Observe that an empty quickpick is shown and there is an error in the console to this effect:

Uncaught Error: Failed to execute 'add' on 'DOMTokenList': The token provided ('codicon block codicon-symbol-property') contains HTML space characters, which are not valid in tokens.

Error: Failed to execute 'add' on 'DOMTokenList': The token provided ('codicon block codicon-symbol-property') contains HTML space characters, which are not valid in tokens.

It appears that Monaco is calling classList.add on the output of this function:

And we're treating a sequence of class names as a single string.

Additional Information

• Operating System: MacOS X Sequoia
• Theia Version: dd1bb84