speedbar-buffer-revert-buffer): Updated buffer finding regex to handle the [?] tag. (speedbar-find-selected-file): New function. (speedbar-clear-current-file): Uses `speedbar-find-selected-file' (speedbar-update-current-file): Uses `speedbar-find-selected-file', and now `speedbar-last-selected-file' is defined as the path name to the file, not just the file itself. (speedbar-center-buffer-smartly): Fixed center error to handle the whole buffer. (speedbar-delete-subblock): Rewrote to be more robust, less clever. (speedbar-timer-fn): Removed short display time for messages.
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