https://bugs.kde.org/show_bug.cgi?id=427778

            Bug ID: 427778
           Summary: Screen not locked after sleep
           Product: kscreenlocker
           Version: unspecified
          Platform: Kubuntu Packages
                OS: Linux
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: general
          Assignee: plasma-b...@kde.org
          Reporter: dt7b64b9...@temp.mailbox.org
                CC: bhus...@gmail.com
  Target Milestone: ---

Created attachment 132398
  --> https://bugs.kde.org/attachment.cgi?id=132398&action=edit
Screen not locked after sleep

SUMMARY
If the computer goes to sleep while an app is being dragged on the panel then
at wake time the screen will not be locked.

STEPS TO REPRODUCE
1. Set Energy Saving setting so "When power button pressed" action is to sleep.
2. Open an app, eg Dolphin
3. Drag the app on the panel, as done to rearrange order of apps on the panel.
4. Put the computer to sleep, eg by pressing the power button (requires power
settings to sleep the computer)
5. Wake the computer later by pressing a key.

OBSERVED RESULT
Desktop is available for use.

EXPECTED RESULT
Lock screen should be shown. Password should be required.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kubuntu 20.04
KDE Plasma Version:  5.18.5
KDE Frameworks Version: 5.68.0
Qt Version: 5.12.8

ADDITIONAL INFORMATION
Video made with VirtualBox attached.

Also seen on openSuse Leap 15.2 in VirtualBox.

Have had several times where my laptop (native, not in VirtualBox) does not
require the password when waking from sleep. Perhaps it's because I have a
touchscreen and have the panel at the top of the screen.  It may be that I
accidentally touch the top of the screen when closing the laptop.  Or perhaps a
firm closure triggers a screen press, maybe the keyboard touches the screen
briefly, before sleep occurs. 

The description above, about the item on the panel, is a re-creatable example I
have found when trying to understand the problem. There may be other ways to
trigger to this bug.

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