Bug 467796

Summary: Two Kmail icons appearing in dock
Product: [Applications] kmail2 Reporter: Georg Schwarz <georg.schwarz>
Component: generalAssignee: kdepim bugs <kdepim-bugs>
Status: REPORTED ---    
Severity: normal CC: scottn
Priority: NOR    
Version First Reported In: 5.22.2   
Target Milestone: ---   
Platform: Manjaro   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:

Description Georg Schwarz 2023-03-25 22:10:46 UTC 
SUMMARY

Using XFCE with Plank as a dock, two Kmail icons appear in the dock when kmail is running, both labelled "KMail". One of the icons is featuring a zero in a red filled circle.


STEPS TO REPRODUCE
1. Install plank (other docks might exhibit the same phenomenon) on XFCE (not sure if other desktop environments exhibit the same issue)
2. launch kmail

OBSERVED RESULT

two KMail icons in the dock

EXPECTED RESULT

only one Kmail icon in the dock

SOFTWARE/OS VERSIONS

Manjaro Linux with XFCE

ADDITIONAL INFORMATION

This might be related to the following bug report: https://bugs.kde.org/show_bug.cgi?id=359600

Also, it is conspicuous that KMail's .desktop file does not have a StartWMClass entry.
Adding StartWMClass=kmail does not change things though.
However I noticed when I add that line to kmail_view.desktop, still two icons appear in the dock, but one of them is now labelled "kmail view" instead of just "kmail".
Are two applications (threads or whatever it is called) launched, and the desktop environment does not understand that they are in fact one single kmail instance?
Comment 1 Georg Schwarz 2023-03-26 20:39:25 UTC 
Additional information: when I switch off "show unread email in taskbar" in Configure Kmail -> Appearance->System Tray, the second icon, the one with the 0 in the red solid circle, no longer shows up in the dock. Only the normal KMail icon remains. Makes me wonder why showing the number of unread emails in the taskbar results in a second icon.

The 0 in the red circle is probably supposed to be the number of unread emails. However in my test setup it is a four-digit number, definitely not 0.