Revert "Remove three <SPC> kbd's for window & frame mgmt"

This reverts commit 02dd7133fc83bbf0ea058fc9f49322098aafbdf0.
Revert "Revert "Remove three <SPC> kbd's for window & frame mgmt""

This reverts commit 05c66f8eabbc8770e05e9b4ef2d28f536e3ca49e.