Fixes Lezer parser to correctly handle whitespace beside multiline comment delimiters.

Author: philipc-mw

src/jupyter_matlab_labextension/src/lezer-matlab/src/parse_comments.js

@@ -16,7 +16,7 @@ const isAlphabetical = (char) => /^[a-zA-Z]$/.test(String.fromCharCode(char));
 
 const lineEndArray = [newline, carriageReturn, fileEnd, fileStart];
 
-const isWhitespace = (char) => /\s/.test(char);
+const isWhitespace = (char) => /\s/.test(String.fromCharCode(char));
 
 const precededByWhitespaceOnly = (input) => {
     // Scan from current position to start of line.

src/jupyter_matlab_labextension/src/lezer-matlab/test/basic_terms.txt

@@ -41,12 +41,19 @@ Script(String)
 # Multiline comment
 
 %{
-  Test multiline comment
+  Test multiline comment.
+%}
+%{
+  Test multiline comment with whitespace before ending delimiter.
+  The whitespace could be a space or a tab, and can be before or
+  after either delimiter without invalidating the multiline comment.
+    %}
+not_a_comment % Line below is a LineComment
 %}
 
 ==>
 
-Script(MultilineComment)
+Script(MultilineComment,MultilineComment,Identifier,LineComment,LineComment)
 
 # Transpose