patch 8.2.5053: cannot have a comment halfway an expression in a block

Problem:    Cannot have a comment halfway an expression in an autocmd command
            block.
Solution:   When skipping over the NL also skip over comments. (closes #10519)

src/testdir/test_autocmd.vim

@@ -3100,6 +3100,22 @@ func Test_autocmd_with_block()
   call assert_equal(77, g:gotSafeState)
   unlet g:gotSafeState
 
+  augroup block_testing
+    au!
+    autocmd CursorHold * {
+      if true
+        # comment
+        && true
+
+        && true
+        g:done = 'yes'
+      endif
+      }
+  augroup END
+  doautocmd CursorHold
+  call assert_equal('yes', g:done)
+
+  unlet g:done
   augroup block_testing
     au!
   augroup END