https://bugs.kde.org/show_bug.cgi?id=404301

            Bug ID: 404301
           Summary: Virtual desktop pager is not displayed when only one
                    desktop exists
           Product: plasmashell
           Version: master
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Pager
          Assignee: h...@kde.org
          Reporter: andydecle...@gmail.com
                CC: plasma-b...@kde.org
  Target Milestone: 1.0

Created attachment 118049
  --> https://bugs.kde.org/attachment.cgi?id=118049&action=edit
Video of pager disappearance

SUMMARY

This is an evolution of [ 404252 ]( https://bugs.kde.org/show_bug.cgi?id=404252
), now that I understand what's happening.

The pager becomes invisible and inaccessible if the number of desktops dips to
one. This is problematic if:

1) the user has one desktop, and tries to add the pager to a panel. Nothing
will appear to happen. So the user may try again, and again, and again,
unwittingly adding many pagers, only to be surprised by them if they eventually
are able to add a desktop.

2) the user has multiple desktops, and uses the pager to add and remove them,
and at any point has one desktop. The user will suddenly no longer be able to
add/remove desktops.

3) the user has multiple desktops, and uses the pager's click-active-desktop
feature, but then at any point has only one desktop, and that feature is
suddenly gone.

The original bug includes a video of attempting to add the pager, with only one
desktop existing.

This bug attaches a video of using the pager to add and remove desktops, until
it becomes impossible.

STEPS TO REPRODUCE
1. Have exactly one desktop
2. Add pager to panel

OR

1. Have 2+ desktops
2. Remove one desktop

OBSERVED RESULT

The interface for desktop operations appears to be deleted without reason or
explanation.

EXPECTED RESULT

The pager remains visible and usable.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux, plasma-desktop 5.15.0-1
(available in About System)
KDE Plasma Version: 5.15.0
KDE Frameworks Version: 5.55.0
Qt Version: 5.12.1

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