when searching backwards, isearch mode does not properly switch into
non case-folding mode:
insert "fooBar" into the buffer and move above it.
C-s f o o B -> switches from `Isearch' to `ISeARch'
move past 'fooBar':
C-r f o o B -> still in `Isearch' (case folding) mode
btw, if someone out there really understands this isearch code
it would be really nice to fix the history mechanism.
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