>>I didn't know who is Andy until you brought his name recently. The mere assumption that few simple code lines is someone's invention is pure imagination.
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>Yes, that's exactly my point.
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>But actually, some ideas originate from somebody but when repeated several times they become commom knowledge. Say, yesterday there was a question about text highlighting. I gave 3 possible solutions from the top of my head, but then decided to search, found another solution, which I forgot to mention + 2 of the mentioned solutions already discussed. I bet I read them few times before and thus how I now know them, but I feel them as my own now.
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>But of course, if I do know who was the author of the particular idea or code I always give this person a credit.

Realistically speaking, our profession is not a rocket science so it's beyond common sense to assume that something could be invented by the only person. One may claim that s/he got some idea independently, but it doesn't mean that others stole it.