You must look at the context and use your inherent intelligence. Both meanings-- simple future and habit-- have the identical form, as you said.
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"Now that he prefers sitting up, again with some practice, he loves sitting in this sling. He will sit in it for hours and be happy as can be. I highly recommend it for this age!"
SpoonfedBabyWe can use "will" to talk about a present habit as we use "would" to talk about a past habit.Succinctly put.