This can be mitigated (ugliness vastly reduced but still not right) by doing System - Preferences - Advanced Desktop Effects Settings - Window Decoration and then turning off shadows with:
Shadow Radius: 0.1 (small as possible) Shadow Windows: none
This can be mitigated (ugliness vastly reduced but still not right) by doing System - Preferences - Advanced Desktop Effects Settings - Window Decoration and then turning off shadows with:
Shadow Radius: 0.1 (small as possible)
Shadow Windows: none