The problem exposing might seems trivial to you. It still isn't clear for me which solution to choose.
Saying that you have a input text where you can type anything. Beneath it a list of ten element and a load more button. Once the user clicks on "load more", ten more elements are added to the list.
My question is, when typing a text to filter, if there is 100 potentials results in the database, should we show the 10 first and a load more button or 20 ? since the user already clicked once on load more, we could expect him to want it to stay as is.