Steps to reproduce: 1. Start Kate 2. Alt+F3 > More actions > Special Application Settings... > Size & Position > Enable Size > Apply Initially: 650,300 3. Resize Kate to some size different than the size set in the step (2) 4. Restart Kate 5. Result: Kate starts with the size set in the step (3), does not follow the Kwin rule set in the step (2) Expected result: Kate starts with the size set in the step (2)
Solved. Also, you need to set: Ignore requested geometry -> Force & Yes (in the Alt+F3 menu)