Zhiyi Zhang (@zhiyi) commented about dlls/comctl32/tests/rebar.c:
+ rbi.cyMinChild = rbi.cxMinChild; + rbi.hwndChild = build_toolbar(1, hRebar); + rbi.fStyle = RBBS_USECHEVRON | RBBS_NOGRIPPER; + SendMessageA(hRebar, RB_INSERTBANDA, 0, (LPARAM)&rbi); + SendMessageA(hRebar, RB_INSERTBANDA, 1, (LPARAM)&rbi); + + SetRectEmpty(&g_chevron_rect); + SendMessageA(hRebar, RB_PUSHCHEVRON, 0, 0); + ok(!IsRectEmpty(&g_chevron_rect), "Unexpected empty chevron rect\n"); + + // increase band width to make it more then ideal value to hide chevron + rbi.fMask = RBBIM_SIZE; + rbi.cx = rbi.cxIdeal << 1; + SendMessageA(hRebar, RB_SETBANDINFOA, 0, (LPARAM)&rbi); + + SetRectEmpty(&g_chevron_rect); I don't think you should set g_chevron_rect empty. You should do the opposite because you're checking for an empty rectangle from the RB_PUSHCHEVRON message.
-- https://gitlab.winehq.org/wine/wine/-/merge_requests/6075#note_76495