If accel_marker is nonzero, the given character will mark the
character following it as an accelerator. For example, accel_marker
might be an ampersand or underscore. All characters marked
as an accelerator will receive a pango.types.Underline.Low attribute,
and the first character so marked will be returned in accel_char.
Two accel_marker characters following each other produce a single
literal accel_marker character.
Sets the layout text and attribute list from marked-up text.
See Pango Markup).
Replaces the current text and attribute list.
If accel_marker is nonzero, the given character will mark the character following it as an accelerator. For example, accel_marker might be an ampersand or underscore. All characters marked as an accelerator will receive a pango.types.Underline.Low attribute, and the first character so marked will be returned in accel_char. Two accel_marker characters following each other produce a single literal accel_marker character.