read-buffer-completion-ignore-case.
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.
+
** Face changes
*** S-down-mouse-1 now pops up a menu for changing the font and text