Constant wlc::ConstraintAdjustment::FlipY

pub const FlipY: Flags = Flags{bits:
          ffi::wlc_positioner_constraint_adjustment_bit_WLC_BIT_CONSTRAINT_ADJUSTMENT_FLIP_Y,}

Invert the anchor and gravity on the y axis if the surface is constrained on the y axis. For example, if the bottom edge of the surface is constrained, the gravity is 'bottom' and the anchor is 'bottom', change the gravity to 'top' and the anchor to 'top'.

If the adjusted position also ends up being constrained, the resulting position of the flip_y adjustment will be the one before the adjustment.