When the semi-transparent tabs flag is on along with the supermium custom tab ui flag, the opacity of the transparent tabs get stacked in the places where they overlap.

[electricgrillsareuseless]

Describe the bug When the Semi-Transparent Tabs flag is on along with the Supermium Custom Tab UI flag, the opacity of the transparent tabs get stacked in the places where they overlap.

To Reproduce 1: Go to chrome://flags 2: Enable #transparent-tabs and #custom-tab-shapes 3: Open more than two tabs

Expected behavior The tabs' overlapped space should look as it does in the top section of my provided screenshot.

Screenshots

Desktop (please complete the following information):

• OS: Windows 10 (Aero10 custom theme + DWMBlurGlass)
• 64 bit

[win32ss]

I'll see if I can prevent drawing of overlapped tabs (so inactive tabs on the right of another inactive tab only start drawing at the end of the overlap), but it may be difficult.