gsettings set org.gnome.desktop.wm.keybindings move-to-corner-nw "as@ '<Super><Shift>Left']"
then I get
unknown keyword: as@ '<Super><Shift>Left']
^^
As for the second approach, namely through dconf, that’s precisely the one that I mentioned in my post as not working.
Incidentally, the sort of simple and effective tiling that I have in mind is possible under Linux Mint and similar distros with Quicktile ( http://ssokolow.com/quicktile/ ). I tried to install it in OpenSuse 42.1 Leap, but I encountered some problems:
Ok, now I’m also able to move windows to NE, NW, SE, SW.
However, this is possible only if the windows are resized and not maximized or aligned on the left or the right side of the screen.
Furthermore, by moving a window to NE etc., that window is not resized to be a fourth of the screen: it keeps its original resized dimension.
This is not very practical, as it implies that first I need to resize each window, and then only I can move it to NE etc.
On the contrary, Quicktile allows to
move each window to NE etc
while resizing it automatically, so that if I’ve four windows open, they occupy smoothly all the screen’s space.
It would be nice if even Gnome 3 allowed this.