TALLAHASSEE — On a day filled with emotion, the Florida Senate Saturday debated measures in response to the Parkland tragedy to spend millions of dollars on school safety and mental health that lawmakers have long neglected and limits on access to guns for the first time in decades. In an unexpected move by a staunchly pro-gun Legislature, senators briefly approved and then rejected a two-year moratorium on sale of AR-15 assault rifles, the type used in the Feb. 14 massacre at Marjory Stoneman Douglas High School in Parkland. The surprise action came on an unrecorded voice vote, in which senators...