Problem: Winbar drawn over status line for non-current window with winbar
if frame is zero height. (Leonid V. Fedorenchik)
Solution: Do not draw the window if the frame height is zero. (closes#8037)
Problem: Various inconsistencies in test files.
Solution: Add modelines where they were missing. Use Check commands instead
of silently skipping over tests. Adjust indents and comments.
(Ken Takata, closes#6695)
Problem: Some balloon tests don't run when they can.
Solution: Split GUI balloon tests off into a separate file. (Ozaki Kiichi,
closes#4538) Change the feature check into a command for
consistency.
Problem: Winbar test doesn't test enough.
Solution: Check that the WinBar actually shows up. Correct check for clicks
with no effect. (Ben Jackson, closes#4338)
