Look at this Link:https://www.doulos.com/knowhow/vhdl_designers_guide/tips/avoid_synthesizing_unwanted_latches/
There are many other articles on this subject. My problem with this has been if statements that do not have a final else to cover the possible other condition not covered by the preceding parts of the statement. I have found that preceding the if statement with a default condition as suggested in the linked article solves this problem (I still use a final else).
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