I use two operating systems daily: Ubuntu 15.04 with the Unity desktop environment and Manjaro with KDE-plasma-5 desktop. I spend a good chunk of time in my email and it is convenient for me to have it behave like a stanalone program, rather than a tab in chromium.
On both systems, I can create a launcher for gmail, via the settings menu under "More tools". On Ubuntu/Unity, I can add this launcher to the panel and it will act as a standalone program with its own separate icon and keyboard shortcut. On Manjaro/KDE, I the gmail shortcut displays a unique icon, but as soon as the program is started, the gmail window will be recognized as a chromium window and it will be merged with existing chromium windows in the panel instead of retaining the icon that is displayed on the shortcut. I have also tried to create the shortcuts directly with command line flags as described in this rather old post, but the behavior is the same.
How can I mimic the Unity behavior in KDE? Is it possible to get a webapp to behave like a standalone program or will it always merge into any existing open chromium window?