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xdg_popup.grab in combination with wl_data_device.start_drag can lead to visual artifacts

(tested with 47d58f7f)

Tested with https://gitlab.freedesktop.org/vyivel/randfall/-/blob/main/cases/xdg_popup_interactive_grab_with_dnd.c

Sending wl_data_device.start_drag followed by xdg_popup.grab (done by pressing the middle mouse button on the toplevel surface) results in opening a grabbing xdg_popup and starting a DnD operation; however, the drag icon doesn't follow the cursor and stays on the screen until the client is closed:

image

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