:tab drop is like :tabedit but if the file is already open in a tab then vim will switch to that tab instead of opening a second copy. However it only works when vim is built with GUI support and has a serious bug. :TabDrop works in vim however it is built and works with plugins that break when using :tab drop due to the bug.
The same as ":tab drop file" but works in terminal vim.
:TabDrop file
Like ":tab drop file" but when the file is already open in a tab then move it before the current tab before selecting it.
:TabDropHere file