I am not 100% sure if this is an Arch AUR problem or if this something you control, so I apologize if the former is true. I noticed that when I launched KMyMoney, it didn't open in the proper icon in my favorites menu. This is the behaviour that usually happens when the WM Class is not set properly. So, I used the command, "xprop WM_CLASS" to examine the window manager class of KMyMoney. -- It was "kmymoney". Next, I edited the desktop file for KMyMoney and say it's StartupWMClass was "Kmymoney" with a capital "K". I changed "K" to lowercase "k" and the problem was solved. Cheers.
Doesn't look like I can edit comments here. Just want to correct my last sentence: 'Next, I edited the desktop file for KMyMoney and found the StartupWMClass was "Kmymoney" with a capital "K". I changed "K" to lowercase "k" and the problem was solved.'
Git commit 8c8f26c44cb19d90f8cbe179f7246d9b9de89832 by Thomas Baumgart. Committed on 12/03/2018 at 15:36. Pushed by tbaumgart into branch '5.0'. Fix StartupWMClass M +1 -1 kmymoney/org.kde.kmymoney.desktop https://commits.kde.org/kmymoney/8c8f26c44cb19d90f8cbe179f7246d9b9de89832