Lookup result windows now force the first column size to be no great than 20 characte...

Lookup result windows now force the first column size to be no great than 20 characters to avoid the code that calls the DB to find the length of the longest string in column, as the code used to get that value is not necessarily portable across all DB platforms

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@31173 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775