code Actions do not seem to work

[alanz]

Opening a file with

foo = id 3

Presents a code action to Evaluate: found id 3, why not 3.

Clicking on the lighbulb and then the presented action does nothing.

Note: The corresponding hint is applied correctly in emacs using emacs-lsp, so I am pretty sure it is a client-side problem.

cc @bubba

[alanz]

Empirically, the current vscode (as used by master here) does not actually send an executeCommand request to apply a hlint hint unless it has first been registered with the client. Even though the UI presents the command, and allows it to be clicked on.

This means that the following commit needs to be reverted in hie: haskell/haskell-ide-engine@386e521, and hence causes #65 to re-appear.

It seems the codeAction machinery is receiving attention at the moment in vscode, via microsoft/language-server-protocol#389

So perhaps we should wait for the dust to settle shortly and see what results.