## Steps to reproduce

1. Run the demo code below
2. Drag and drop a file into the window
- When dragging the filer over the window, a label saying '…drop it here' appears.
- After dropping, the label vanishes.
3. Click on any KDE Plasma widget (e.g. clipboard, network, ...) in the panel to open it.

## Current behavior
When clicking on the the Plasma widget to open it, the 'drag motion' event is triggered and the overlay becomes permanently displayed.
```
...
Drag Motion: time: 8271120 x: 770 y: 39
Drag Motion: time: 8271136 x: 769 y: 39
Drag Motion: time: 8271163 x: 769 y: 39
Drag Motion: time: 0 x: 769 y: 39
Drag Motion: time: 0 x: 769 y: 39
```
Interestingly the drop time is in this case always zero and drop position is the same as in step 2 from "Steps to reproduce".

## Expected outcome
When clicking on the the Plasma widget to open it, the 'drag motion' event is not triggered.

## Version information
GTK Version: 3.24.35
GLib Version: 2.74.0
Operating System: openSUSE Tumbleweed 20230110
KDE Plasma Version: 5.26.5
KDE Frameworks Version: 5.101.0
Qt Version: 5.15.7
Graphics Platform: Wayland

## Additional information
```
import gi
gi.require_version("Gtk", "3.0")
gi.require_version('Gdk', '3.0')
from gi.repository import Gdk
from gi.repository import Gtk

TARGET_TYPE_URI_LIST = 80


class MyWindow(Gtk.Window):
    def __init__(self):
        super().__init__(title="Hello World")
        self.set_default_size(800, 600)

        self._drop_area = Gtk.Box(
        orientation=Gtk.Orientation.VERTICAL, spacing=18)
        self._drop_area.set_no_show_all(True)
        self._drop_area.add(Gtk.Label(label='…drop it here'))

        overlay = Gtk.Overlay()
        overlay.add_overlay(self._drop_area)
        overlay.connect('drag-data-received', self._on_drag_data_received)
        overlay.connect('drag-motion', self._on_drag_motion)
        overlay.connect('drag-leave', self._on_drag_leave)

        uri_entry = Gtk.TargetEntry.new(
            'text/uri-list',
            Gtk.TargetFlags.OTHER_APP,
            TARGET_TYPE_URI_LIST)

        dnd_list = [uri_entry,
                    Gtk.TargetEntry.new(
                        'OBJECT_DROP',
                        Gtk.TargetFlags.SAME_APP,
                        0)]

        dst_targets = Gtk.TargetList.new([uri_entry])
        dst_targets.add_text_targets(0)

        overlay.drag_dest_set(
            Gtk.DestDefaults.ALL,
            dnd_list,
            Gdk.DragAction.COPY | Gdk.DragAction.MOVE)
        overlay.drag_dest_set_target_list(dst_targets)

        self.add(overlay)
        self.show_all()


    def _on_drag_data_received(self,
                               _widget: Gtk.Widget,
                               _context: Gdk.DragContext,
                               _x_coord: int,
                               _y_coord: int,
                               selection: Gtk.SelectionData,
                               target_type: int,
                               _timestamp: int
                               ) -> None:
        pass


    def _on_drag_leave(self,
                       _widget: Gtk.Widget,
                       _context: Gdk.DragContext,
                       _time: int
                       ) -> None:
        self._drop_area.set_no_show_all(True)
        self._drop_area.hide()


    def _on_drag_motion(self,
                        _widget: Gtk.Widget,
                        _context: Gdk.DragContext,
                        _x_coord: int,
                        _y_coord: int,
                        _time: int
                        ) -> bool:
        self._drop_area.set_no_show_all(False)
        self._drop_area.show_all()
        print(f"Drag Motion: time: {_time} x: {_x_coord} y: {_y_coord}")
        return True

win = MyWindow()
Gtk.main()
```