Shows GUI tabs only when not in fullscreen mode.
Installation
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Use your standard bundle manager
" Using Vundle Bundle 'jordwalke/MacVimSmartGUITabs' " Or if using NeoBundle(recommended) NeoBundle 'jordwalke/MacVimSmartGUITabs'
Enable GUI tabs in MacVim
set guioptions+=e
Map your desired keyboard combination to trigger fullscreen
map <D-Cr> :SmartGUITabsToggleFullScreen<CR>
imap <D-Cr> <Esc>:SmartGUITabsToggleFullScreen<CR>
Make sure your .gvimrc doesn't also try to control full screen using the same key combination.
In .gvimrc map the full screen keyboard shortcut to something totally different.
macmenu Window.Toggle\ Full\ Screen\ Mode key=<D-c-f>