[3.12] gh-112105: Make completer delims work on libedit (gh-112106) (gh-112487)

gh-112105: Make completer delims work on libedit (gh-112106)
(cherry picked from commit 2df26d83486b8f9ac6b7df2a9a4669508aa61983)

Co-authored-by: Tian Gao <gaogaotiantian@hotmail.com>