applet drag&drop between panel and desktop

[WuYongbo]

Hi guys,

I am very curious the way plasma used to drag&drop applets between panel and
desktop:

1, drag applets from desktop to panel: user cannot drag applets directly but
with a handle, why ?
2, drag applets from panel to desktop: user cannot drag applets directly but
with a PanelAppletOverlay cover, why ?

why plasma does not use the "*Drag and Drop*" mechanism ?

BTW, what should I do if I want to drag applets from desktop to panel
directly ?

-- 
Good luck !
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