I really wish we could make uniformity a trend again. GTK has basically made it a rule that applications must do whatever the heck they want.
Then next day I'm using Inkscape on a Mac. Cmd-A on the canvas selects all elements. Cmd-A in a text field selects all elements on the canvas - and whatever text was in the field, now applies to the selection, so I start typing and instantly get garbage.
How do you Select All in a text field? Ctrl-A of course! - On the only system that has a non-broken copy/paste in the terminal.
I guess props to Thunderbird for leaving some space on the title bar to drag the window around? Do not take it for granted.