Facing a certain veto, state lawmakers have abandoned their effort to require that textbooks in California schools detail the history and achievements of gays and lesbians in America. State Sen. Sheila Kuehl (D-Santa Monica), the author of SB 1437, said she made the change even though it removed 90% of the import of the measure, which would have been the first in the country to mandate the teaching of homosexuals' contributions. But Schwarzenegger's office, which had taken the rare step of announcing his intention to veto the bill, provided no encouraging signal that he would change his mind. "The governor...