Observations: I see that in Options | Show/Hide Tabs are on by default
(good!), but when I start Emacs I do not see any tabs. I still need 'M-x
tab-new' to see some tab. I would expect that, if Tabs are on by default,
starting Emacs shows desktop buffers in tabs, at least compatibly with the
starting 'geometry' of Emacs.
I implemented a new command line argument, so a command:
emacs --tabs file1 file2 file3
will open each file in a new tab. And
emacsclient --create-tab
creates a new tab on the current Emacs frame.