I hate: Programming Wayland applications

The only problem that has existed is that originally there was a single DPI value, not a different DPI value for each monitor.

This has never created any problem for the people using multiple monitors with the same resolution, but only for the people who have used multiple monitors having different resolutions and who might have not liked the changes in windows size when moving a window from a monitor to another monitor.

That was indeed a problem, but it really affected a rather niche use case and it was also trivial to solve without any change in the X11 design, by just making DPI a per monitor variable, which was done long ago.

So criticizing X11 about a supposed problem with HiDPI is incorrect. I have used only multiple 4k monitors with my PCs, with X11, for more than a dozen years and I never had any problem with HiDPI, with the exception of many Java programs written by morons, which ignore the system settings and which also do not allow the user to change the font used by them. I do not know which is the problem with the Java programmers, but I never encountered programs with such a behavior, except those written in Java. Moreover, the Java programs are also the only that had problems with monitors using 10-bit per color component.

While X11 itself never had problems with supporting HiDPI, at least not in the XFCE that I am using, I heard that other desktop environments have created problems with HiDPI that have nothing to do with X11, by not exposing the X11 DPI settings but providing instead some "window scaling" settings, which is something that I do not know how it is implemented, but there are good chances that it is implemented in a wrong way, judging from the complaints that I have seen. I cannot imagine how one could use correctly a "window scaling" factor, because the font rendering program must know the true DPI value when rendering for instance a 12-point font. If rendering is done at a wrong DPI and then the image is scaled, the result is garbage, so in that case it would not be surprising that people claimed that HiDPI works badly in X11, when in fact it was Gnome or whatever desktop environment was used who was guilty for bad support, not X11. I never had to fight with those desktop environments, but I assume that even those would have worked correctly with HiDPI, when using xrandr to configure X11, instead of using the settings of the desktop environment.

What it does is simple - all the functions that deal with windows/handles or events simply do not work on ones that you don't have access to, for example, the EnumWindows function allows you to wall through the tree of windows simply do not see the ones the process has no access to. SetWindowsHookEx which allows you to intercept and modify messages meant for other windows simply doesnt fire for messages you're not supposed to access.

Granted, outside of UWP apps, the application of security is rather lax (this is for legacy purposes, the security's there, just not enforced), but for apps running as admin, or UWP apps, the sandboxing is rather solid.

Anyone know of exceptions? People who get mesa working anyhow, some way?

It also doesn't preclude people from making nicer experiences on top of libwayland. Again I'd be curious to see what material is out there. It feels like a library that materializes the current state of things into a local view would go a long way to dispel the rage of people such as the author here, who seem to detest callbacks with firey rage.

The idea of the wayland registry seem unifying & grand to me. Ok yes it's async & doesn't hide it? Lot of ink spilled to be upset about that, and doesn't feel like an immutable fact that must govern life, if that for some reason makes you as mad as this dude.