Also delete the lineinput selection when pressing backspace/delete and the key for skipping words (Ctrl/GUI key, Alt on macOS) is held. This is consistent with the behavior in other applications.

Check if the active line input was not rendered and deactivate it in that case. This can happen e.g. when an input in the ingame menu is active and the menu is closed or when switching between menu and editor with an active input. This was causing the IME candidate list to be rendered ingame after closing the menu.