gvim and i3 not playing too well together

It seems gvim is not playing nicely with tiling manager.  I encountered this bug.

It seems I am not alone with this problem.  To maximize and restore the window each time doesn't seem to be a good workaround.  The workaround I used are from the stackexchange, add the following line into my .vimrc:

set showtabline=2

It always display the tab bar.  Although it wastes some spaces, it gives me a proper displayed window.