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When foldUpdateIEMSRecurse() re-uses an existing fold, it misses the case where the existing fold spans from before startlnum to after firstlnum, the new fold does not span this range, and there is no "forced start" of a fold. We add a case for this in. Ensure that if there was no forced break in folds, we merge folds that now touch each other. Include testing for a tricky foldmethod=expr case that has never been a bug. This case works at the moment because of some effects that are not obvious when reading the code. A test for this could be useful to ensure a regression doesn't happen. vim-patch:8.0.0408