Search for keybindings like so:

gsettings list-recursively | grep keybindings

Set a keybinding like so:

org.gnome.desktop.wm.keybindings close "['<Alt>F5']"

Note that keyboard tweaks overlapping bindings will break the latter. For instance, switch-applications-backward ['<Alt><Shift>Tab'] will be overridden by layout switch "Left Alt" + "Left Shift", so that ['<Left Alt><Left Shift>Tab'] will not work, where as ['<Left Alt><Right Shift>Tab'] will.

Setting keybinding for layout switch like so gsettings set org.gnome.desktop.wm.keybindings switch-input-source "['<Shift>Alt', '<Super>space']" or gsettings set org.gnome.desktop.wm.keybindings switch-input-source "['<Alt>Shift', '<Super>space']" does not make it work.

Hope someone will find this useful.

Gnome v3.28.1

Search for keybindings like so:

gsettings list-recursively | grep keybindings

Set a keybinding like so:

org.gnome.desktop.wm.keybindings close "['<Alt>F5']"

Note that keyboard tweaks overlapping bindings will break the latter. For instance, switch-applications-backward ['<Alt><Shift>Tab'] will be overridden by layout switch "Left Alt" + "Left Shift", so that ['<Left Alt><Left Shift>Tab'] will not work, where as ['<Left Alt><Right Shift>Tab'] will.

Setting keybinding for layout switch like so gsettings set org.gnome.desktop.wm.keybindings switch-input-source "['<Shift>Alt', '<Super>space']" or gsettings set org.gnome.desktop.wm.keybindings switch-input-source "['<Alt>Shift', '<Super>space']" does not make it work.

Gnome v3.28.1