Retrieves the current text size group for the tool shell. Tool items must not call this function directly, but rely on gtk_tool_item_get_text_size_group() instead.
the current text size group of @shell
2.20
See Implementation
Retrieves the current text size group for the tool shell. Tool items must not call this function directly, but rely on gtk_tool_item_get_text_size_group() instead.