Here's the symptoms:
- The line number column no longer glows blue for edits. It's always grey.
- Clicking the play widget in the column does nothing. The only way to run is the play button on the bottom.
- Typing an open brace then Enter to start a code block doesn't add the closing brace.
- Closing then reopening, quitting then rerunning, or rebooting then running doesn't fix this.
Xcode 11 is installed from the Mac App store. Xcode going into non-functional fits during playgrounds has happened before; is there any way to fix this besides waiting and hoping?