Fix reordering for KDE, and dragging to the end

[hirak99]

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Description

Please include a summary of the changes including relevant motivation and context.

Fixes #2705 -

The drag-drop API does not work on this extension under KDE. Switching over to mouse events retains this ability, and works under KDE. Note: I have note tested outside KDE.

Fixes #2665 -

In addition, this also fixes the issue of moving to the end.

Demo video -

screencast_multi_user_container_reorder_fix.mp4

Type of change

Select all that apply.

• Bug fix
• New feature
• Major change (fix or feature that would cause existing functionality to work differently than in the current version)

Tag issues related to this pull request:

#2705, #2665

[ranjan-purbey]

It seems that elements inside web-extension popup windows do not receive dragover or drop events in firefox running in a KDE wayland session. So using mouse events as a workaround seems good.