Wow, I was stalled for days now because I couldn't figure out why my queue of outstanding #X11 replies always quickly overflowed.

Turns out one factor was a simple coding error in text rendering test code, leading to repeatedly issuing the same requests 🙈.

But I didn't find that because processing also stalled. Turns out integrating #xcb correctly with your own event loop is somewhat tricky 🤯.

I guess I figured it out now, finally 🥳. And for the first time ever, I found a good use for #C11's _Generic() 😂. Screenshot is lots of debugging output, the batch of confirmed requests on the bottom is from requests uploading #glyphs, and trying to use some #xrender stuff with them. Now for the hard part: My window stays plain white ... 😒