@eliocamp @RaphaelWimmer @noheger
The difference is that you folks are making a mountain out of a molehill and then @menos blames #GNOME, saying it "can be trusted to copy the stupidest ideas from everybody else"… whereas here it was the other way around, and the behavior in GNOME (& others) has been that way for decades even with square corners (I wouldn't be surprised if it was due to technical limitations too).
This is true for non-GNOME and non-GTK apps too, like LibreOffice, Qt apps, etc.