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Just annotations of little "how to's", so I know I can find how to do something I've already done when I need to do it again, in case I don't remember anymore, which is not unlikely. Hopefully they can be useful to others, but I can't guarantee that it will work, or that it won't even make things worse.
If you accidentally (or not) click/hold and drag the left mouse button from the inner area ("client" or "any empty area") in a KDE/QT window, it starts to be dragged/moved along, but it's not dropped when you release the button, unlike the behavior with GTK windows (at least GTK2, I guess). You got to press "enter" or "esc", I guess.
Presumably that doesn't happen under KDE proper/kwin, maybe not even with other window managers, but I didn't...
At least in Ubuntu wily, it doesn't seem to allow you to chose the default application to open a file type. You try to do it, but it "magically" restores the previous default association before your eyes. Even if you chanced the config file, somehow. (I'm assuming it's mimeapps.lst, but I'm not sure. It seems that it's cool nowadays to have cryptic, hidden config files, avoiding to mention them unless strictly necessary, pretending it's all magic and config files don't exist)
Whereas gtk-qt-engine doesn't work very well, that is, GTK can't be easily made to "simulate" QT/KDE themes, the converse seems to work very well, and apparently no additional package is needed for that, but QT alone, or actually just qtconfig-qt4, in order to set the QT/KDE* theme as "GTK+".
So one third of the problem of desktop uniformity is solved if you have one GTK2 (I believe it's GTK2, not 3, I'm not sure) theme that you find good enough to have both in...
I noticed that there was no longer the "extract" context submenu for zip files after one of the last updates. Then I went to check the ".desktop" files on /usr/share/kde4, and noticed that they had an editing mistake in the mimetype line: