[PATCH 0/1] MR3507: win32u: Copy an incoming CB_GETCOMBOBOXINFO when packing it for the client.

[Tim Clem (＠tclem)]

The only important field at this point is cbSize, but if it's zero, the
message will not be processed.

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The other option would be to zero the buffer and then do the equivalent of `((COMBOBOXINFO *)buffer)->cbSize = sizeof(COMBOBOXINFO)`, rather than copying the incoming lparam. That doesn't seem better to me, but I'm no expert.