I wanted to add MeefastDial instead oh "Phone" app. So I notice it is that quicklaunchbarX.desktop entry is exact copy of application.desktop file in /usr/share/applications
I just renamed quicklaunchbar0.desktop to bkp.quicklaunchbar0.desktop then copied meefast.desktop to .local/share/applications/quicklaunchbar0.desktop
After that - no icon in launch bar.
Then I tried to get thing back again, renaming the files. So now I have the original quicklaunchbar0.desktop for Phone, pointing to the correct entry, but still no icon shown in quick launch bar.