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=32672
=== w7u (32 bit combo) === combo.c:786: Test failed: Test 2, expected list height to be 16, got 0 combo.c:786: Test failed: Test 3, expected list height to be 16, got 18 combo.c:786: Test failed: Test 4, expected list height to be 32, got 18 combo.c:786: Test failed: Test 5, expected list height to be 32, got 36 combo.c:786: Test failed: Test 6, expected list height to be 32, got 36 combo.c:786: Test failed: Test 7, expected list height to be 32, got 36 combo.c:786: Test failed: Test 8, expected list height to be 32, got 36 combo.c:786: Test failed: Test 11, expected list height to be 16, got 0 combo.c:786: Test failed: Test 12, expected list height to be 16, got 18 combo.c:786: Test failed: Test 13, expected list height to be 32, got 18 combo.c:786: Test failed: Test 14, expected list height to be 48, got 36 combo.c:781: Test failed: Test 15, expected list height to be 48, got 54 combo.c:786: Test failed: Test 16, expected list height to be 64, got 54 combo.c:786: Test failed: Test 17, expected list height to be 64, got 72 combo.c:315: Test failed: Focus not on Main Window, instead on 00000000
Fixed the one failure, but it looks like this machine does have a different listview-item size. Have to look into it.