Ranger->Cleric and Cleric/Ranger having druid spells: how is it exactly?

How exactly does this stuff with ranger->clerics (and a cleric/rangers) having access to both cleric and druid spells works these days? I've read about it here and there, but the resources are hazy at best; some are a decade old, and it might have been changed/patched since then. I don't even know whether it's a bug or a feature.
Does a Ranger 2 -> Cleric just get all the druid spells for all subsequent levels as soon as he unlocks those levels as a cleric, no questions asked? Does he need to be lvl 9 before dualing to have access to them? Does he only gain access to the druid spells that his ranger level would allow him to cast? Or does he lose them entirely?
And what about Cleric/Ranger? Does he gain access to the druid spells only once he's on lvl 9 with Ranger? And is it all spells or just he ones his Ranger exp would allow?
Does a Ranger 2 -> Cleric just get all the druid spells for all subsequent levels as soon as he unlocks those levels as a cleric, no questions asked? Does he need to be lvl 9 before dualing to have access to them? Does he only gain access to the druid spells that his ranger level would allow him to cast? Or does he lose them entirely?
And what about Cleric/Ranger? Does he gain access to the druid spells only once he's on lvl 9 with Ranger? And is it all spells or just he ones his Ranger exp would allow?
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Comments
Ranger 2 -> Cleric ... no druid spells
Ranger 8 -> Cleric ... 1st level druid spells
Ranger 10 -> Cleric ... 1st + 2nd level druid spells
Ranger 12+ -> Cleric ... 1st + 2nd + 3rd level druid spells
this is also true for a multiclass ranger/cleric
So I guess the best way for druid spells as the character is going with multiclass rather than duals.
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