def toggle_fold_trigger(self, block):
"""
Toggle a fold trigger block (expand or collapse it).
:param block: The QTextBlock to expand/collapse
"""
if not TextBlockHelper.is_fold_trigger(block):
return
region = FoldScope(block)
if region.collapsed:
region.unfold()
if self._mouse_over_line is not None:
self._add_scope_decorations(
region._trigger, *region.get_range())
else:
region.fold()
self._clear_scope_decos()
self._refresh_editor_and_scrollbars()
self.trigger_state_changed.emit(region._trigger, region.collapsed)
