I had openSUSE Leap 42.3 and I installed new openSUSE Leap 15.1 as "semi-clean" install - I formatted system partition, but I didn't touch home partition. I use the user from previous installation. Almost everything works, only wrong thing is icon of IntelliJ IDEA application. The icon in "start menu" looks good, but after I start IntelliJ IDEA, it uses IntelliJ WebStorm icon on the taskbar. I had similar problems on different computer after update from Leap 42.1 to 42.2 (IntelliJ IDEA icon was fine, but PHPStorm and Yast icon was missing). I can fix it with creating a new system user, but then I will lost all my settings.

I thought I will fix it with delete ~/.cache , but I have no success. I tried to delete /var/tmp/kdecache-myuser but still no success. Where else can I find cache (or config??) which is breaking it?