I have installed (i.e. accepted the webapp installation prompts within Firefox) both Gmail and Twitter as Unity webapps, so that I can launch them directly from the side panel. One thing has me puzzled though: when I launch Twitter, it behaves similar to a regular application (except for the fact that it also causes a browser instance to be launched). Unity seems to track its execution, showing indicators (those little arrows) on both sides of the Twitter app icon. This, however, is not the case with the Gmail launcher. Clicking on it causes the browser to be opened and taken to the Gmail page, but there are no indicators on the Gmail icon, as if it served as a mere link and nothing else.
Is there a way to make the Gmail Unity webapp behave the same way Twitter's does? I have checked the .desktop files for both launchers but found nothing of relevance. Just in case, I'm posting their contents below.
Exec=unity-webapps-runner -n 'VHdpdHRlcg==' -d 'twitter.com' %u
Thank you in advance for any tips.
Exec=unity-webapps-runner -n 'R01haWw=' -d 'mail.google.com' %u