Put breadcrumbs on overlay instead of inserting to buffer (bug#5809).
* info.el (Info-find-node-2): Comment out code that skips breadcrumbs line. (Info-mouse-follow-link): New command. (Info-link-keymap): New keymap. (Info-breadcrumbs): Rename from `Info-insert-breadcrumbs'. Return a string with links instead of inserting breadcrumbs to the Info buffer. (Info-fontify-node): Comment out code that inserts breadcrumbs. Instead of putting the `invisible' text property over the Info header, make an overlay over the Info header with the `invisible' property and `after-string' set to the string returned by `Info-breadcrumbs'.
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