When the List timesteps according to controlDict checkbox is turning on,  (he reader lists time instances according to descriptions in controlDectrol) == (yes, adjustableRunTime) or (no, timeStep) (i. writing interval is supposed to be constant in simulated time), or otherwise, lists all validt ime directorie.
When the List timesteps according to controlDict checkbox is turned on, the reader lists time instances according to descriptions in controlDict when (adjustTimeStep, writeControl) == (yes, adjustableRunTime) or (no, timeStep) (i. e. writing interval is supposed to be constant in simulated time), or otherwise, lists all valid time directories.