Playing DOOM on Linux

I was in a nostalgic mood and bought Ultimate Doom and Doom II + Final Doom from GOG. There was even a discount in the beginning of January. I searched SBo for a way to play the game and it seems to offer quite a lot of options. After some reading and tries, I decided that the best option for me is prboom-plus. So, here’s what I did:
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Archaeopteryx configuration 2

Couple of years ago, I wrote about the configuration file of Archaeopteryx, a phylogenetic tree analysis program. I have set it to use native ui, as described in my old post. However, some things have changed meanwhile, so in order to have a white background, additional tweaks are required.
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Vivaldi HTML5 Proprietary Media

I have been playing with Vivaldi browser recently. It is available from SBo, where the recommended dependencies are pepperflash-plugin, ffmpeg and vivaldi-codecs-ffmpeg-extra. However, I still seemed to experience problems with some websites content. Maybe I did something wrong…

So, what to do?
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Disable GTK3 window management

Some GTK3 programs, such as file-roller and Evince, use their own custom title bar with minimize, maximize and close buttons. Under Xfce, I have experienced hiccups with Evince when maximized: it would refuse to unmaximize the window (or rather, does not remember the dimensions of the unmaximized window) and behaves kinda “sticky” to desktop borders. In another case, if I have the compositor turned off, the window edges are not smoothened and look ugly.
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QT5 screen scale factor

In my previous post, I described the problem of having too large interface buttons, search fields, scroll bars, etc of Calibre (compiled against QT5). I found a fix of Calibre, however, it seems this problem occurs for other QT5 programs. For example, I installed AlienBob’s VLC package, version 3.0.4 on Slackware64 14.2 and noticed the same issue. So, a more general solution should be found.
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