Is there a way to define the size of the error window?
yep something like let g:syntastic_loc_list_height=3
let g:syntastic_loc_list_height=3
see :help syntastic_loc_list_height
:help syntastic_loc_list_height
This should probably be the default?
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yep something like
let g:syntastic_loc_list_height=3see
:help syntastic_loc_list_height