Search for some package. Select one for installation. Now, change a filter (I toggled "only show new packages"). The view will be refreshed: the selected-for-installation package does no longer have the check mark, however, it cannot be clicked again and in fact is still marked for installation (clicking apply installs the package correctly).
Keep hunting those bugs! THANKS! commit 6f11ca044722cf6ea4222e79953644411bc9fb40 Author: Richard Hughes <richard> Date: Fri Jan 23 12:58:50 2009 +0000 bugfix: stop abusing a PkPackageList as a list to store package_id's, as the PkInfoEnum changes when we do a filter change