Bug with bottle.mp3 was fixed in 6.1.5, also this fix is in 6.1.4-6.1.5 patch.

Dolphin 6.1.6 has not this bug at all.

The only problem if you try to apply 6.1.5-6.1.6 patch to Dolphin 6.1.4, but this is wrong way and you need to apply patches incrementally, one by one. So, if you have Dolphin 6.1.4 and you want to upgrade to Dolphin 6.1.6 you need to apply 6.1.4-6.1.5 patch and then 6.1.5-6.1.6 patch.

Dolphin 7 is being developed separately, and this bug is not fixed in Dolphin 7 yet, but see more will be fixed very soon. (Thank you Sammie for remind this)