Activate minimise all plasmoid on mouse enter if the user is dragging mimedata
Summary:
This allows the user to easily drag a file from dolphin into a
folderview on a desktop even if windows are in the way.
BUG: 376212
Test Plan:
Dragged an item, things minimised
Normal mouse enter, nothing happened
Click still works as normal
Reviewers: Plasma
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D4521