broken on gnome 46 : 'PanelContainer' object has no attribute 'get_visible_child'

[realKarthikNair]

karthik@fedora:~$ gedit --version
gedit - Version 46.1

karthik@fedora:~$ gedit
Traceback (most recent call last):
  File "/home/karthik/.local/share/gedit/plugins/markdown_preview/__init__.py", line 93, in do_activate
    self.preview.do_activate()
  File "/home/karthik/.local/share/gedit/plugins/markdown_preview/main_container.py", line 52, in do_activate
    self.build_preview_ui()
  File "/home/karthik/.local/share/gedit/plugins/markdown_preview/main_container.py", line 207, in build_preview_ui
    self.show_on_panel()
  File "/home/karthik/.local/share/gedit/plugins/markdown_preview/main_container.py", line 463, in show_on_panel
    self.panel.add_titled(self.preview_bar, 'markdown_preview', _("Markdown Preview"))
    ^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'PanelContainer' object has no attribute 'add_titled'
Traceback (most recent call last):
  File "/home/karthik/.local/share/gedit/plugins/markdown_preview/__init__.py", line 101, in do_update_state
    self.preview.do_update_state()
  File "/home/karthik/.local/share/gedit/plugins/markdown_preview/main_container.py", line 70, in do_update_state
    elif self.panel.get_visible_child() != self.preview_bar:
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'PanelContainer' object has no attribute 'get_visible_child'
Traceback (most recent call last):
  File "/home/karthik/.local/share/gedit/plugins/markdown_preview/__init__.py", line 101, in do_update_state
    self.preview.do_update_state()
  File "/home/karthik/.local/share/gedit/plugins/markdown_preview/main_container.py", line 70, in do_update_state
    elif self.panel.get_visible_child() != self.preview_bar:
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'PanelContainer' object has no attribute 'get_visible_child'
Traceback (most recent call last):
  File "/home/karthik/.local/share/gedit/plugins/markdown_preview/__init__.py", line 101, in do_update_state
    self.preview.do_update_state()
  File "/home/karthik/.local/share/gedit/plugins/markdown_preview/main_container.py", line 70, in do_update_state
    elif self.panel.get_visible_child() != self.preview_bar:
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'PanelContainer' object has no attribute 'get_visible_child'
Traceback (most recent call last):
  File "/home/karthik/.local/share/gedit/plugins/markdown_preview/__init__.py", line 101, in do_update_state
    self.preview.do_update_state()
  File "/home/karthik/.local/share/gedit/plugins/markdown_preview/main_container.py", line 70, in do_update_state
    elif self.panel.get_visible_child() != self.preview_bar:
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'PanelContainer' object has no attribute 'get_visible_child'
Traceback (most recent call last):
  File "/home/karthik/.local/share/gedit/plugins/markdown_preview/main_container.py", line 357, in on_file_changed
    self._update_panel_visibility()
  File "/home/karthik/.local/share/gedit/plugins/markdown_preview/main_container.py", line 485, in _update_panel_visibility
    if self.panel.get_visible_child() == self.preview_bar:
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'PanelContainer' object has no attribute 'get_visible_child'