read-buffer-completion-ignore-case.
element, it wraps to the last history element, and the forward search
wraps to the first history element. When the search is terminated, the
history element containing the search string becomes the current.
-
++++
*** The variable read-file-name-completion-ignore-case overrides
completion-ignore-case for file name completion.
-
++++
*** The variable read-buffer-completion-ignore-case overrides
completion-ignore-case for buffer name completion.
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