[PATCH 0/1] MR9442: comctl32/treeview: check for child item before SendExpanding

[Thomas Csovcsity (＠thc13)]

In TREEVIEW_Collapse the TREEVIEW_SendExpanding call could change the
item->firstChild value, therefore check it before for early return.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=23077

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https://gitlab.winehq.org/wine/wine/-/merge_requests/9442