lsp: set winid before calling handlers

Set the active window to the window that was active when the request was
made before processing the response so that handlers can set the correct
statusline, use the correct location list, etc.

autoload/go/lsp.vim

@@ -114,17 +114,27 @@ function! s:newlsp() abort
           try
             let l:handler = self.handlers[l:response.id]
 
+            let l:winid = win_getid(winnr())
+            " Always set the active window to the window that was active when
+            " the request was sent. Among other things, this makes sure that
+            " the correct window's location list will be populated when the
+            " list type is 'location' and the user has moved windows since
+            " sending the reques.
+            call win_gotoid(l:handler.winid)
+
             if has_key(l:response, 'error')
               call l:handler.requestComplete(0)
               if has_key(l:handler, 'error')
                 call call(l:handler.error, [l:response.error.message])
               else
                 call go#util#EchoError(l:response.error.message)
               endif
+              call win_gotoid(l:winid)
               return
             endif
             call l:handler.requestComplete(1)
             call call(l:handler.handleResult, [l:response.result])
+            call win_gotoid(l:winid)
           finally
             call remove(self.handlers, l:response.id)
           endtry