History of shader 1 change

In crates/backdrop/src/gl.rs, lines 91–100 on 2bbdc0268c23bb07c0fd0ea8922eb70e8bfa18da6bb303ec4a59e7ab5dae7fe2. Every change that wrote or deleted one of these lines, or deleted a line from between them. Exact, because each line keeps its identity across edits; edits elsewhere in the file are not here. Also: oxy log -L 91,100:crates/backdrop/src/gl.rs.