System crash in workspace when message widget is closed after syntax error

[mzimmerm]

Steps to duplicate:

• Go to https://newspeaklanguage.org/samples/primordialsoup.html?snapshot=HopscotchWebIDE.vfuel
• Click "Workspaces" link
• In the input field, type something syntactically invalid, for example: 1+
• Shift-Enter to attempt evaluation
• An error shows
• Click the "x" beside the error
• After this, Shift+Enter no longer functions to evaluate, the Shift modifier seems to be not sent to the input field

From a follow up by Gilad on the google group, this is a system crash:

What happens is that, when we have a syntax error, clearing the result list gets to deal with a parse error instead of a thread, which is what it expects. And, because we have a longstanding problem that crashes within the IDE don't go to the debugger, the result is a complete crash :-(. The system is dead; the editor is a CodeMirror editor, and it's javascript code keeps responding to events, so you can still type into it - so it may not be obvious that the system actually crashed.

[mzimmerm]

Gilad fixed this even before I reported this :)

For the record: I bring the fix in like this:

• Looked for files committed on Github. 
• Found only one file changed, today Browsing.ns. As my local server uses the servable.zip file, I assume Browser.ns is already compiled in the vfuel
• .- So from the browser IDE, http://localhost:8080/primordialsoup.html?snapshot=HopscotchWebIDE.vfuel from the 3-dot I "compile" the new version of Browsing.ns 
• Saved IDE- Confirmed by re-exporting, of Browsing.ns that the change is in my local version.
• Retest: Now closing the error widget works as expected, and after fixing the input, Shift-Enter evaluates the expression.