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I'm not disagreeing, but on the Ubuntu MATE computer I'm using now, for graphical apps at least, I have only have apps using GTK+ — including partial users like

I'm not disagreeing, but on the Ubuntu MATE computer I'm using now, for graphical apps at least, I have only have apps using GTK+ — including partial users like Firefox —, Qt and wxWidgets (plus mpv, which doesn't seem to have any dialogs anyway). Qt and wxWidgets adapt to GTK+ conventions when used with GTK, or use parts of GTK+, like open/save dialogs, so everything, or nearly so, that I use is Cancel/OK. I think GNOME started intentionally copying MacOS starting with the GTK+ 2 days. Out of curiosity, I just installed Blender, which uses its own custom toolkit. The only dialogs I could find were open and save, and it has the open/save actions on top and cancel below. (That's actually what unstyled(?) Qt apps' open/save dialogs do too, as I've just seen in KeepassXC installed as a Snap.) That's one way to not take sides here ;-)

badsectoracula 8y ago
AFAIK in Qt you can "tag" the OK/Cancel buttons and the theme can provide a hint to swap them around, however the default seems to be OK/Cancel and KDE uses that going back to KDE1. I've also heard (but not confirmed since i do not have it) that if you use GNOME and run a Qt app, Qt will automatically swap the buttons - if that is the case then it might also do it with other common GTK+-based DEs. About the vertical orientation, actually i've noticed that not only in Blender but in other programs and toolkits too. In the latter toolkits, it most likely comes from Win9x/2K/XP which used this vertical layout (i think Vista rearranged the buttons to be horizontal).