(dired-isearch-filenames): Add new context-dependent
option `dwim'. Change non-dwim option from `dired-filename' to `t'. Doc fix. (dired-isearch-filenames-setup): Run filename Isearch only when dired-isearch-filenames is t or dired-isearch-filenames is `dwim' and the text property `dired-filename' at point is non-nil. In this case also set isearch-message-prefix-add to "filename ". (dired-isearch-filenames-end): Set isearch-message-prefix-add to nil. (dired-isearch-filenames, dired-isearch-filenames-regexp): Don't let-bind isearch-message-prefix-add since this is done now in dired-isearch-filenames-setup.
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