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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Calibre interface size

I have Calibre version 3.31 installed from SBo. On my laptop it looks and works just fine. Howevere, my desktop computer has some issues with its QT5 interface. Icons, menus and address bars are way too big. I googled a bit and found that other users have had the same complaints.
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Own packages repository

I decided to try and make my own repository of precompiled packages from SBo. Exactly the same idea as SlackRepo, but made by me for my own use (not public). The tool to use is SlackRepo, which has extensive documentation, that I highly recommend. This post is not meant as a tutorial on how to use SlackRepo. It merely lists the settings I used and the steps I took for my own use.
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Blueman RfKill State

I made a clean install of Slackware64 14.2 on my laptop. I updated the system to the latest patches and when I logged in to Xfce I was presented with a weird dialogue window. Apparently it belongs to Blueman, telling me that “Setting RfKill State requires privileges”. Even when I enter my password, it would appear again upon every log in. Very annoying. However, the solution was recently discussed at LQ.
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