Got lots of errors in terminal and core dump (meld app crash)

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/meld/diffgrid.py", line 34, in do_realize
    self._handle1.realize(self)
  File "/usr/lib/python3/dist-packages/meld/diffgrid.py", line 270, in realize
    attr.cursor = Gdk.Cursor.new_for_display(widget.get_display(),
TypeError: constructor returned NULL
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/meld/diffgrid.py", line 46, in do_map
    self._handle1.set_visible(True)
  File "/usr/lib/python3/dist-packages/meld/diffgrid.py", line 288, in 
set_visible
    self._window.show()
AttributeError: 'NoneType' object has no attribute 'show'
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/meld/diffgrid.py", line 201, in 
do_size_allocate
    self._handle1.set_visible(mapped and wlink1 > 0)
  File "/usr/lib/python3/dist-packages/meld/diffgrid.py", line 288, in 
set_visible
    self._window.show()
AttributeError: 'NoneType' object has no attribute 'show'
...

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/meld/diffgrid.py", line 53, in do_unmap
    self._handle1.set_visible(False)
  File "/usr/lib/python3/dist-packages/meld/diffgrid.py", line 290, in 
set_visible
    self._window.hide()
AttributeError: 'NoneType' object has no attribute 'hide'
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/meld/diffgrid.py", line 38, in 
do_unrealize
    self._handle1.unrealize()
  File "/usr/lib/python3/dist-packages/meld/diffgrid.py", line 284, in unrealize
    self._widget.unregister_window(self._window)
AttributeError: 'NoneType' object has no attribute 'unregister_window'
**
Gtk:ERROR:../../../../gtk/gtkwidget.c:5583:gtk_widget_unrealize: assertion 
failed: (!widget->priv->mapped)
Bail out! Gtk:ERROR:../../../../gtk/gtkwidget.c:5583:gtk_widget_unrealize: 
assertion failed: (!widget->priv->mapped)
Aborted (core dumped)

After running `sudo apt install adwaita-icon-theme-full`, all those
Traceback and AttributeError went away

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https://bugs.launchpad.net/bugs/1994518

Title:
  Missing dependencies of meld

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