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: 7.39. szakasz - Alpha to Selection
Add to Selection: 7.40. szakasz - Add Alpha channel to Selection
Subtract from Selection: 7.41. szakasz - Subtract from Selection
Intersect with Selection: 7.42. szakasz - Intersect Alpha channel with Selection