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When Orca has "Speak object under mouse" enabled, it tries to get the text range extents for any object that implements the AtkText interface and gets a bit confused by our AtkText stub implementation that merely returns null for `get_text`. Removing the stub implementation helps to avoid the issue that Orca would try to call `atk_text_get_range_extents()` with `start_offset=0` and `end_offset=0`: > Atk-CRITICAL **: atk_text_get_range_extents: assertion 'start_offset >= 0 && start_offset < end_offset' failed