fix key formatting when switching to a dotted `WorkspaceSource`
fix key formatting when switching to a dotted `WorkspaceSource`

nipunn1313/cargo,rustyhorde/cargo,rust-lang/cargo,nipunn1313/cargo,eminence/cargo,eminence/cargo,nipunn1313/cargo,rustyhorde/cargo,rust-lang/cargo,rust-lang/cargo,rustyhorde/cargo,eminence/cargo,nipunn1313/cargo,rustyhorde/cargo,rust-lang/cargo,eminence/cargo