History of gc 4 changes

In src/cli/workspace.rs, lines 1017–1052 on 2c75672fb2fe0ff6bfe8be8f2230ba153204b7422615abccc6aefa24380bbe2e. 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 1017,1052:src/cli/workspace.rs.