VSE timeline strips now have rounded corners. Strip corner rounding radius is 4, 6 or 8px depending on strip height (if strip is too narrow to fit rounding, then rounding is turned off). This is achieved with a dedicated GPU shader for drawing most of VSE strip widget, that it could do proper rounded corner masking. More details and images in the PR. Pull Request: https://projects.blender.org/blender/blender/pulls/122576