Add a 'open server logs' button to the error notification

editors/code/src/client.ts

@@ -316,6 +316,7 @@ class ExperimentalFeatures implements lc.StaticFeature {
         caps.hoverActions = true;
         caps.serverStatusNotification = true;
         caps.colorDiagnosticOutput = true;
+        caps.openServerLogs = true;
         caps.commands = {
             commands: [
                 "rust-analyzer.runSingle",

editors/code/src/ctx.ts

@@ -187,6 +187,11 @@ export class Ctx {
                     this.setServerStatus(params)
                 )
             );
+            this.pushClientCleanup(
+                this._client.onNotification(ra.openServerLogs, () => {
+                    this.outputChannel!.show();
+                })
+            );
         }
         return this._client;
     }

editors/code/src/lsp_ext.ts

@@ -21,6 +21,7 @@ export interface ServerStatusParams {
 export const serverStatus = new lc.NotificationType<ServerStatusParams>(
     "experimental/serverStatus"
 );
+export const openServerLogs = new lc.NotificationType0("rust-analyzer/openServerLogs");
 
 export const reloadWorkspace = new lc.RequestType0<null, void>("rust-analyzer/reloadWorkspace");