These commands are displayed only if a text layer is present.
In the Text to Selection drop-down list, the commands are identical to those of the Transparency sub-menu (in fact, the text is formed of areas of different transparency):
Text to Selection: Seção 7.38, “Alfa para a seleção”
Add to Selection: Seção 7.39, “Adicionar canal Alfa à seleção”
Subtract from Selection: Seção 7.40, “Subtrair da seleção”
Intersect with Selection: Seção 7.41, “Interseção do Canal Alfa com a Seleção”