fix(tracking): Calling Actions.setMetadata from applyTransforms no longer works

src/flux/stores/draft-store.coffee

@@ -381,31 +381,34 @@ class DraftStore
     # Run draft transformations registered by third-party plugins
     allowedFields = ['to', 'from', 'cc', 'bcc', 'subject', 'body']
 
-    Promise.each @extensions(), (ext) ->
-      extApply = ext.applyTransformsToDraft
-      extUnapply = ext.unapplyTransformsToDraft
-      unless extApply and extUnapply
-        return Promise.resolve()
-
+    session.changes.commit(noSyncback: true).then =>
       draft = session.draft().clone()
-      Promise.resolve(extUnapply({draft})).then (cleaned) =>
-        cleaned = draft if cleaned is 'unnecessary'
-        Promise.resolve(extApply({draft: cleaned})).then (transformed) =>
-          Promise.resolve(extUnapply({draft: transformed.clone()})).then (untransformed) =>
-            untransformed = cleaned if untransformed is 'unnecessary'
 
-            if not _.isEqual(_.pick(untransformed, allowedFields), _.pick(cleaned, allowedFields))
-              console.log("-- BEFORE --")
-              console.log(draft.body)
-              console.log("-- TRANSFORMED --")
-              console.log(transformed.body)
-              console.log("-- UNTRANSFORMED (should match BEFORE) --")
-              console.log(untransformed.body)
-              NylasEnv.reportError(new Error("An extension applied a tranform to the draft that it could not reverse."))
-            session.changes.add(_.pick(transformed, allowedFields))
+      Promise.each @extensions(), (ext) ->
+        extApply = ext.applyTransformsToDraft
+        extUnapply = ext.unapplyTransformsToDraft
+        unless extApply and extUnapply
+          return Promise.resolve()
 
-    .then =>
-      session.changes.commit(noSyncback: true)
+        Promise.resolve(extUnapply({draft})).then (cleaned) =>
+          cleaned = draft if cleaned is 'unnecessary'
+          Promise.resolve(extApply({draft: cleaned})).then (transformed) =>
+            Promise.resolve(extUnapply({draft: transformed.clone()})).then (untransformed) =>
+              untransformed = cleaned if untransformed is 'unnecessary'
+
+              if not _.isEqual(_.pick(untransformed, allowedFields), _.pick(cleaned, allowedFields))
+                console.log("-- BEFORE --")
+                console.log(draft.body)
+                console.log("-- TRANSFORMED --")
+                console.log(transformed.body)
+                console.log("-- UNTRANSFORMED (should match BEFORE) --")
+                console.log(untransformed.body)
+                NylasEnv.reportError(new Error("An extension applied a tranform to the draft that it could not reverse."))
+              draft = transformed
+
+      .then =>
+        DatabaseStore.inTransaction (t) =>
+          t.persistModel(draft)
 
   _onRemoveFile: ({file, messageClientId}) =>
     @sessionForClientId(messageClientId).then (session) ->

src/pro

@@ -1 +1 @@
-Subproject commit 1c66da339a724a1562354e07433170033f5c8638
+Subproject commit ec04ee3f59272cfa5de87ff465b2e675eafa19ad

src/window-event-handler.coffee

@@ -42,12 +42,12 @@ class WindowEventHandler
     ipcRenderer.on 'scroll-touch-end', ->
       window.dispatchEvent(new Event('scroll-touch-end'))
 
-    window.addEventListener 'beforeunload', =>
+    window.onbeforeunload = =>
       # Don't hide the window here if we don't want the renderer process to be
       # throttled in case more work needs to be done before closing
       return @runUnloadCallbacks()
 
-    window.addEventListener 'unload', =>
+    window.onunload = =>
       NylasEnv.storeWindowDimensions()
       NylasEnv.saveStateAndUnloadWindow()
 
@@ -108,10 +108,12 @@ class WindowEventHandler
     @unloadCallbacks.push(callback)
 
   runUnloadCallbacks: ->
+    hasReturned = false
+
     unloadCallbacksRunning = 0
     unloadCallbackComplete = =>
       unloadCallbacksRunning -= 1
-      if unloadCallbacksRunning is 0
+      if unloadCallbacksRunning is 0 and hasReturned
         @runUnloadFinished()
 
     for callback in @unloadCallbacks
@@ -122,6 +124,7 @@ class WindowEventHandler
         console.warn "You registered an `onBeforeUnload` callback that does not return either exactly `true` or `false`. It returned #{returnValue}", callback
 
     # In Electron, returning false cancels the close.
+    hasReturned = true
     return (unloadCallbacksRunning is 0)
 
   runUnloadFinished: ->