Show window icons in titlebar

I generally find it hard to distinguish the type of window just based on the title. I'm wasting time reading titles and being confused about whether I'm switching to a console, browser window or something else. Workspaces alone don't fix it, they are only useful to group windows, not distinguish them visually. Icons fix this easily with little visual overhead.

There were several i3 window titlebar icon patches. Also see the screenshot.

I wasn't able to find an existing issue report about this.