vim-patch:8.2.1004: line numbers below filler lines not always updated

Problem:    Line numbers below filler lines not always updated.
Solution:   Don't break out of the win_line() loop too early. (Christian
            Brabandt, closes vim/vim#6294, closes vim/vim#6138)
511feec6f0

src/nvim/screen.c

@@ -3068,10 +3068,12 @@ win_line (
     }
 
     // When still displaying '$' of change command, stop at cursor
-    if ((dollar_vcol >= 0 && wp == curwin
-         && lnum == wp->w_cursor.lnum && vcol >= (long)wp->w_virtcol
-         && filler_todo <= 0)
-        || (number_only && draw_state > WL_NR)) {
+    if (((dollar_vcol >= 0
+          && wp == curwin
+          && lnum == wp->w_cursor.lnum
+          && vcol >= (long)wp->w_virtcol)
+         || (number_only && draw_state > WL_NR))
+        && filler_todo <= 0) {
       grid_put_linebuf(grid, row, 0, col, -grid->Columns, wp->w_p_rl, wp,
                        wp->w_hl_attr_normal, false);
       // Pretend we have finished updating the window.  Except when

src/nvim/testdir/test_diffmode.vim

@@ -1,6 +1,7 @@
 " Tests for diff mode
 source shared.vim
 source screendump.vim
+source check.vim
 
 func Test_diff_fold_sync()
   enew!
@@ -801,6 +802,34 @@ func Test_diff_closeoff()
   enew!
 endfunc
 
+func Test_diff_rnu()
+  CheckScreendump
+
+  let content =<< trim END
+    call setline(1, ['a', 'a', 'a', 'y', 'b', 'b', 'b', 'b', 'b'])
+    vnew
+    call setline(1, ['a', 'a', 'a', 'x', 'x', 'x', 'b', 'b', 'b', 'b', 'b'])
+    call setline(1, ['a', 'a', 'a', 'y', 'b', 'b', 'b', 'b', 'b'])
+    vnew
+    call setline(1, ['a', 'a', 'a', 'x', 'x', 'x', 'b', 'b', 'b', 'b', 'b'])
+    windo diffthis
+    setlocal number rnu foldcolumn=0
+  END
+  call writefile(content, 'Xtest_diff_rnu')
+  let buf = RunVimInTerminal('-S Xtest_diff_rnu', {})
+
+  call VerifyScreenDump(buf, 'Test_diff_rnu_01', {})
+
+  call term_sendkeys(buf, "j")
+  call VerifyScreenDump(buf, 'Test_diff_rnu_02', {})
+  call term_sendkeys(buf, "j")
+  call VerifyScreenDump(buf, 'Test_diff_rnu_03', {})
+
+  " clean up
+  call StopVimInTerminal(buf)
+  call delete('Xtest_diff_rnu')
+endfunc
+
 func Test_diff_and_scroll()
   " this was causing an ml_get error
   set ls=2