Merge #3389

3389: Note vscode remote limitation when client install fails r=matklad a=not-much-io

Just adding a note about the limitation referenced in #2522 

Considered checking if this message is relevant in the context (is this remote?) but decided against it because of return on investment - seeing how fast vscode iterates this limitation might just disappear in the near future.

Also checked if there is a way to already do this which lead me to leaving a specifing question at microsoft/vscode-remote-release#385 

Co-authored-by: nmio <[email protected]>

Author: bors[bot]

xtask/src/install.rs

@@ -122,7 +122,8 @@ fn install_client(ClientOpt::VsCode: ClientOpt) -> Result<()> {
     if !installed_extensions.contains("rust-analyzer") {
         bail!(
             "Could not install the Visual Studio Code extension. \
-             Please make sure you have at least NodeJS 12.x together with the latest version of VS Code installed and try again."
+            Please make sure you have at least NodeJS 12.x together with the latest version of VS Code installed and try again. \
+            Note that installing via xtask install does not work for VS Code Remote, instead you’ll need to install the .vsix manually."
         );
     }