I use, and love, tabs, using the following in my .emacs:
(global-set-key [(control shift iso-lefttab)] 'tabbar-backward-tab)
(global-set-key [(control tab)] 'tabbar-forward-tab)
Since upgrading my distro a few months back (i'm sure it wasn't true before that), i've found that if i load several files with different extensions, then the tabs appear in different groups; e.g.,
emacs junk1.txt junk4.txx junk2.txt junk3.ttx junk9.txt
gives me one "screen" (if you see what i mean) that has tabs for junk1.txt, junk2.txt, and junk9.txt; and another with tabs for both junk4.txx and junk3.ttx (and yes, those two do have different extensions).
I can, of course, switch buffers to move between "screens" (and, err, between buffers); but what i want is to have tabs for ALL my files visible in a single "screen", so i can tab through all of them. Any ideas how to achieve that (or for that matter, why i don't currently get that behaviour)?
GNU Emacs 26.2 (build 1, x86_64-mageia-linux-gnu, GTK+ Version 3.24.7) of 2019-04-12