'Expands all fold triggers.'

def expand_all(self):

    block = self.editor.document().firstBlock()
    while block.isValid():
        TextBlockHelper.set_collapsed(block, False)
        block.setVisible(True)
        block = block.next()
    self._clear_block_deco()
    self._refresh_editor_and_scrollbars()
    self.expand_all_triggered.emit()
