save and restore the size of the window
save and restore the size of the window

store the old nerd tree window size as a tabpage local variable and
restore it when reloading the tree window

tschundler/dotfiles,iff/dotfiles-old,nywilken/dotfiles,tschundler/dotfiles,iff/dotfiles-old,tschundler/dotfiles,nywilken/dotfiles