(isearch-edit-string): Save old point and
isearch-other-end to old-point and old-other-end before reading the search string from minibuffer. After exiting minibuffer set point to old-other-end if point and the search direction is the same as before reading the search string. (isearch-del-char): Don't set isearch-yank-flag to t. Put point to isearch-other-end. Instead of isearch-search-and-update call three functions isearch-search, isearch-push-state and isearch-update.
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