how to open an already opened file into an new tab?

[lin q]

Hi,
 Let us say VIM already have f1 and f2 opened in 2 tabs, when I opened f2 I 
use this command:

  vim --servername GVIM1 --remote-tab f2

 This causes that on the tabline, the full path of f2 shows after some 
abbreviation. Now I want to open f2 into another tab, but I do not find an 
easy way to do that.

 If use :tabe, I need to type in the full path of f2, for my case, it is 
very long.

 Any suggestion?

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