debounce outline subscriptions

Author: aviatesk

lib/runtime/outline.js

@@ -18,7 +18,7 @@ export function activate (ink) {
   subs.add(client.onDetached(() => pane.setItems([])))
 
   let edSubs = new CompositeDisposable()
-  subs.add(atom.workspace.onDidChangeActiveTextEditor(ed => {
+  subs.add(atom.workspace.onDidChangeActiveTextEditor(throttle(ed => {
     if (!ed) return
 
     edSubs.dispose()
@@ -65,7 +65,7 @@ export function activate (ink) {
     }).then(outlineItems => {
       outline = handleOutline(ed, edSubs, outlineItems)
     })
-  }))
+  }, 300)))
 }
 
 // NOTE: update outline and symbols cache all in one go