Fix memory leak: free marks when destroying containers (#2578)
Fix memory leak: free marks when destroying containers (#2578)


Airblader/i3-original,cornerman/i3,acrisci/i3,cornerman/i3,avrelaun/i3,shdown/i3,Airblader/i3,cornerman/i3,avrelaun/i3,Airblader/i3,Airblader/i3,shdown/i3,stapelberg/i3,i3/i3,shdown/i3,acrisci/i3,Airblader/i3-original,i3/i3,i3/i3,stapelberg/i3,acrisci/i3,stapelberg/i3,cornerman/i3,acrisci/i3,avrelaun/i3,Airblader/i3-original,avrelaun/i3,stapelberg/i3,Airblader/i3-original,acrisci/i3,i3/i3,Airblader/i3,Airblader/i3-original,shdown/i3