Google Calendar has been updated recently, but a quick glance at the change log only finds "Bug fixes and performance improvements." What actually happened? Not much, but what's there is a doozy - replying to calendar events from within Gmail should now be a much less tedious experience.
Now when you press Yes, Maybe, or No in an email invite, you will get a toast notification confirming your response. That's it - you're done. Before this update, users were thrust out to the calendar app with the event. From there we could actually respond, then go back to Gmail. It was a bothersome, unnecessary step that has now been removed. Here's a picture of the new functionality next to the old, for comparison.
It may seem like something needs to change on the Gmail app's end for this to take place, but as it turns out, that's not the case. Upgrading from com.google.android.calendar-201308021.apk to com.google.android.calendar-201308023 is all you need to do.
The update is out, but if you don't have it yet, we've provided a mirror below.
The APK is signed by Google and upgrades your existing app. The cryptographic signature guarantees that the file is safe to install and was not tampered with in any way. Rather than wait for Google to push this download to your devices, which can take days, download and install it just like any other APK.
File name: com.google.android.calendar-201308023.apk
File Size: 2.5 MB