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If the last tag toggle is the end iter, the function returned the wrong tag toggle. This resulted in some bugs where the view wasn't relayout/redrawn correctly. The function also always returned TRUE, probably because the return value is used nowhere. But for consistency with _gtk_text_btree_get_iter_at_first_toggle(), it's better to keep the return value, and also because otherwise the function would be wrong (it doesn't always return a tag toggle, if there is none). https://bugzilla.gnome.org/show_bug.cgi?id=755413
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