Setup a key binding to copy window content

Question

I'm having trouble setting up a key binding to copy the content of the terminal window. So far, the best I've got is

key_bindings:
  # copy window content with F2
  - { key: F2,          mode: ~Search,           action: ToggleViMode         }
  - { key: F2,          mode: Vi|~Search,        action: High                 }
  - { key: F2,          mode: Vi|~Search,        action: ToggleLineSelection  }
  - { key: F2,          mode: Vi|~Search,        action: ScrollToBottom       }
  - { key: F2,          mode: Vi|~Search,        action: Copy                 }
  - { key: F2,          mode: ~Search,           action: ToggleViMode         }

When I press it, the clipboard does not get filled. Do you have any idea?

Edit:
The problem seems to be the mode switching. The following works, but requires to press two buttons:

key_bindings:
  - { key: F3,                           action: ToggleViMode         }
  - { key: F2,          mode: Vi,        action: High                 }
  - { key: F2,          mode: Vi,        action: ToggleLineSelection  }
  - { key: F2,          mode: Vi,        action: Low                  }
  - { key: F2,          mode: Vi,        action: Copy                 }
  - { key: F2,          mode: Vi,        action: ClearSelection       }
  - { key: F2,          mode: Vi,        action: ToggleViMode         }