[PATCH 1/2] user32/combo: Add more tests for listbox_size

[Marvin]

Hi,

While running your changed tests on Windows, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?

Full results can be found at:
https://testbot.winehq.org/JobDetails.pl?Key=48140

Your paranoid android.


=== debian9 (32 bit Japanese:Japan report) ===

user32:
combo.c:768: Test succeeded inside todo block: Test 9, expected list height to be 36, got 36
combo.c:768: Test failed: Test 13, expected list height to be 0, got 15
combo.c:768: Test succeeded inside todo block: Test 18, expected list height to be 54, got 54