It appears that individual emails within a conversation can be inconsistently labelled – I think this arises when using GMail on Android where individual messages can be labelled.
This problem arose when I searched for "mykeyword -label:mylabel" and conversations showed up which WERE ALREADY labelled with mylabel. SOME of the messages WITHIN the conversation were not labelled with mylabel, so the entire conversation showed up.
Is there a way to review all the label variation within a conversation and conform them? Right now, I have to unlabel and relabel the conversation.
Best Answer
This is a part of Gmail's default "conversations" feature. If you turn off the conversations function in gmail and then do your search it will not show the parts of the conversation already labeled.