Description:
When opening a LO calc file by double clicking on it in a nautilus windows (a Linux file manager), the new task bar entry sometimes appears with a wrong icon (wrong file type). LO uses the icon of the LO file type that is already open instead of the file type that is to be opened.

Steps to Reproduce:
1.open LO writer with an odt file
2.start nautilus file manager
3.double click on an ods file in nautilus to open it

Actual Results:
LO calc starts a new windows with the selected calc file. However, the task list icon for the new window shows a writer icon.

Expected Results:
opening a window for a new calc file should always use a calc icon in the task bar.


Reproducible: Sometimes


User Profile Reset: No



Additional Info:
* the system here is Debian 10 "buster" running Cinnamon Desktop Environment.
* the bug is reproducible with different file managers (nautilus, nemo, thunar, gnome commander)
* strangely, the bug does NOT always occur, but in about 50% of the cases when opening a file. Even opening the SAME file yields a 50% bug occurence! Unfortunately I could not find a pattern, when or why the bug occurs. Seems completely random to me.
* it seem to me that LO always opens a new windows with the previous file type icon first, then changes the icon after ca .25 seconds. Sometimes the icon change does not happen.

Version: 6.1.5.2
Build-ID: 1:6.1.5-3
CPU-Threads: 2; BS: Linux 4.19; UI-Render: Standard; VCL: gtk3; 
Gebietsschema: de-DE (de_DE.utf8); Calc: group threaded