bug#20971: 24.4; occur-1 makes my buffer read-only

[Alex Schröder]

I'm using isearch to search for something, then I use M-s o to run an occur for my search term. This results in *Occur* being shown and in the buffer I'm searching to be read-only. This is confusing. I think what people intended was to make *Occur* read-only. But occur-mode already inherits from special-mode which already does (setq buffer-read-only t).

I therefore propose to simply remove the (setq buffer-read-only t) line from the end of occur-1 in replace.el. See attached patch.

fix_occur.patch
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