Fix #2168: surround spacing bug

In Vim, the commands `yw` and `yaw` will also yank any trailing
whitespace. However, during a surround command `ysaw`, we want to
exclude that whitespace to avoid an offset.

src/actions/plugins/surround.ts

@@ -438,7 +438,9 @@ export class CommandSurroundAddToReplacement extends BaseCommand {
       let start = vimState.surround.range.start;
       let stop = vimState.surround.range.stop;
 
-      stop = stop.getRight();
+      if (TextEditor.getCharAt(stop) !== ' ') {
+        stop = stop.getRight();
+      }
 
       if (vimState.surround.isVisualLine) {
         startReplace = startReplace + '\n';