Bind RET in Log View mode to a command that toggles a more detailed display.
* lisp/vc/log-view.el: New command log-view-toggle-entry-display for toggling log entries between concise and detailed forms. (log-view-toggle-entry-display): New command. (log-view-mode-map): Bind RET to it. (log-view-expanded-log-entry-function): New variable. (log-view-current-entry, log-view-inside-comment-p) (log-view-current-tag): New functions. (log-view-toggle-mark-entry): Use log-view-current-entry and log-view-end-of-defun instead of searching directly with log-view-message-re. (log-view-end-of-defun): Likewise. Add optional ARG for compatibility with end-of-defun. (log-view-end-of-defun): Ignore comments and VC buttons. * lisp/vc/vc-bzr.el (vc-bzr-expanded-log-entry): New function. (vc-bzr-log-view-mode): Use log-view-expanded-log-entry-function.
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