Sets whether this is locked.
See [the migration guide](migrating-to-breakpoints.html#replace-adwflap)
If `FALSE`, folding when the flap is revealed automatically closes it, and unfolding it when the flap is not revealed opens it. If `TRUE`, [property@Flap:reveal-flap] value never changes on its own.
this |
a flap |
locked |
the new value |