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I changed the Super+Space shortcut to Super using some command I don't remember now (It's been 2-3 weeks). But I don't like it, it gets in the way many times during my work, and also Super+Space never got removed, Super simply gained the shortcut and it now exists for both shortcuts. So, I want to go back.
How can I remove the Super shortcut for the application menu?
Probably you did use the command gXg pointed out. To revert changes, do:
gsettings reset org.gnome.desktop.wm.keybindings panel-main-menu
To open application search only by pressing Super(win) key:
gsettings set org.gnome.mutter overlay-key "'Super_L'" gsettings set org.pantheon.desktop.gala.behavior overlay-action "'wingpanel --toggle-indicator=app-launcher'"
Now you should reverse engineer these commands. Hope it helps.
From gxg's help the command is:
gsettings set org.gnome.mutter overlay-key " "
Change it to empty space:" "
I used dconf-editor to check the value of org.gnome.mutter overlay-key and found it was Super_L from the answer linked here.
Dconf-editor can also be used to change the value.