bug#44397: 28.0.50; tab-bar-mode: tab-switcher creates a new tab every time

[Zhiwei Chen <condy0919@gmail.com>]

,----[ C-h f tab-switcher RET ]
| tab-switcher is an interactive compiled Lisp function in ‘tab-bar.el’.
| 
| It is bound to SPC t i, <normal-state> SPC t i.
| 
| (tab-switcher)
| 
|   Probably introduced at or before Emacs version 27.1.
| 
| Display a list of named window configurations.
| The list is displayed in the buffer ‘*Tabs*’.
| It’s placed in the center of the frame to resemble a window list
| displayed by a window switcher in some window managers on Alt+Tab.
| 
| In this list of window configurations you can delete or select them.
| Type ? after invocation to get help on commands available.
| Type q to remove the list of window configurations from the display.
| 
| The first column shows ‘D’ for a window configuration you have
| marked for deletion.
`----

The docstring doesn't say it will create a new tab but a
`tab-bar-new-tab' call will be made eventually. It's like that `ibuffer'
will create a new (dummy) buffer (not the special *Ibuffer* buffer). Any
reasons on that?

-- 
Zhiwei Chen