History of shader 1 change

In crates/backdrop/src/gl.rs, lines 91–100 on 1870e4fa98086468364a61d2fa556f7fe5913bccd31404c75d8836cb12097d6c. 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.