patch 8.2.3932: C line comment not formatted properly

Problem:    C line comment not formatted properly.
Solution:   If a line comment follows after "#if" the next line is not the end
            of a paragraph.
diff --git a/src/testdir/test_textformat.vim b/src/testdir/test_textformat.vim
index 62cefa1..07a9224 100644
--- a/src/testdir/test_textformat.vim
+++ b/src/testdir/test_textformat.vim
@@ -223,6 +223,21 @@
   END
   call assert_equal(expected, getline(1, '$'))
 
+  %del
+  let text =<< trim END
+      #if 0           // This is another long end of
+                      // line comment that
+                      // wraps.
+  END
+  call setline(1, text)
+  normal gq2j
+  let expected =<< trim END
+      #if 0           // This is another long
+                      // end of line comment
+                      // that wraps.
+  END
+  call assert_equal(expected, getline(1, '$'))
+
   bwipe!
 endfunc