Top level windows with 0 width or height are created with a size of 1x1 in
[wine] / tools / winapi_check /
drwxr-xr-x   ..
-rw-r--r-- 4772 modules.dat
-rw-r--r-- 4845 modules.pm
-rw-r--r-- 1818 nativeapi.dat
-rw-r--r-- 2835 nativeapi.pm
-rw-r--r-- 2115 output.pm
-rw-r--r-- 3314 preprocessor.pm
drwxr-xr-x - win16
drwxr-xr-x - win32
-rw-r--r-- 16961 winapi.pm
-rwxr-xr-x 20870 winapi_check
-rw-r--r-- 3791 winapi_function.pm
-rw-r--r-- 1487 winapi_global.pm
-rw-r--r-- 10464 winapi_local.pm
-rw-r--r-- 11887 winapi_options.pm
-rw-r--r-- 10014 winapi_parser.pm