https://bugs.kde.org/show_bug.cgi?id=485337

            Bug ID: 485337
           Summary: Dragging a window under the bottom of the screen
    Classification: Plasma
           Product: kwin
           Version: unspecified
          Platform: Neon
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: wayland-generic
          Assignee: kwin-bugs-n...@kde.org
          Reporter: kevindu52defarg...@protonmail.com
  Target Milestone: ---

Created attachment 168351
  --> https://bugs.kde.org/attachment.cgi?id=168351&action=edit
reproduction with a firefox window

SUMMARY
Stumbled on a way to drag a window just under the bottom the display.
It then doesn't appear on the overview or desktop grid effects.
It can't be reached using the mouse, since the cursor can't go there.
Looks like an off-by-one error between the cursor and the window's positions.

STEPS TO REPRODUCE
A. With firefox
1. Open a firefox window, and maximize it.
2. Push the cursor to the top of the screen.
3. Click and drag the cursor to the bottom of the screen.

B. With dolphin
1. Open a dolphin window, and maximize it.
2. Push the cursor to the top of the screen.
3. Drag the window using Meta + left click.
4. Push the cursor to the bottom of the screen.


OBSERVED RESULT
The window is completely hidden. There is now no way to interact with it using
the mouse.

EXPECTED RESULT
The topmost line of pixel of the window should still be visible on the bottom
of the screen.
The window should still appear on the overview effect or the desktop grid.

SOFTWARE/OS VERSIONS
Operating System: KDE neon Testing Edition
KDE Plasma Version: 6.0.4
KDE Frameworks Version: 6.1.0
Qt Version: 6.6.3
Kernel Version: 6.5.0-26-generic (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 5600H with Radeon Graphics
Memory: 15.0 GiB of RAM
Graphics Processor: AMD Radeon Graphics

ADDITIONAL INFORMATION
On this example there is only one 1920*1080 display connected to the computer.

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