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Verifying tags in the wrong file

From: Juanma Barranquero
Subject: Verifying tags in the wrong file
Date: Wed, 9 Nov 2022 12:46:58 +0100

M-x load-library <RET> etags <RET>
M-: (tags-verify-table "any-file-not-tags") <RET>

It returns nil and leaves behind a buffer visiting the file, in Tags Table mode. Not nice, but more or less as expected. Not a bug.

However, if you verify a (no tags) file already being visited in a buffer, it returns nil and *leaves* the buffer in Tags Table mode!

Well, you'll say, "don't do that". Ok, except that you can do it by accident, for example if you're using bs-show and happen to type "t" in the wrong line.

Which, arguably, could be fixed in bs (though I think it's a bug in etags.el, not bs.el), except that I don't think there's a tags-table-buffer-p or equivalent to check that the buffer contains a Tags Table. The way to test it seems to be `tags-verify-table'... 

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