Small feature request - "window-icon" setting as bubble icon

[nzr]

Hi, currently you can pass a custom image as "Window icon" which is cool; I would really like to see the possibility to have such a setting for the icon which is shown when using the minimized-style "bubble".

So what about re-using the variable "window-icon" as icon when showing the bubble? Would be great to see.

    window-icon="some-cool-icon.png"
    minimized-style="bubble">

Thanks a lot.