Fix error when using "Rewrap At... command" (#324)

Unlike the `rewrapCommentCommand` function, `rewrapCommentAtCommand` has
to be async, because it shows the input popup first. So it can't use the
editBuilder passed directly in (this gives the error "Edit is only valid
while callback runs").

So we have to go back to the old way of using the `editor.edit(...)`
function here. Don't think any harm should come from this.

vscode/src/Extension.ts

@@ -29,7 +29,7 @@ function rewrapCommentCommand (editor: TextEditor, editBuilder: TextEditorEdit)
 let customWrappingColumn = 0;
 
 /** Does a rewrap, but first prompts for a custom wrapping column to use. */
-async function rewrapCommentAtCommand (editor: TextEditor, editBuilder: TextEditorEdit)
+async function rewrapCommentAtCommand (editor: TextEditor)
 {
   let columnStr = customWrappingColumn > 0 ?
     customWrappingColumn.toString() : undefined
@@ -41,7 +41,8 @@ async function rewrapCommentAtCommand (editor: TextEditor, editBuilder: TextEdit
   if (columnStr === undefined) return // The user pressed cancel
 
   customWrappingColumn = parseInt(columnStr) || 0
-  doWrap (editor, editBuilder, customWrappingColumn)
+  // Since this is an async function, we have to use editor.edit
+  editor.edit (editBuilder => doWrap (editor, editBuilder, customWrappingColumn))
 }