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bug#28403: 25.2; find-tag works, but xref-find-definitions

From: Dmitry Gutov
Subject: bug#28403: 25.2; find-tag works, but xref-find-definitions
Date: Mon, 11 Sep 2017 00:43:51 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:56.0) Gecko/20100101 Thunderbird/56.0

On 9/10/17 5:29 PM, Eli Zaretskii wrote:

Try adding `tag-symbol-match-p' to
etags-xref-find-definitions-tag-order. This example should work then,
but you'll get more false positives (like treating return types as
function names).

Dmitry, how about providing a more user-friendly customization to that
effect?  As a "fire escape"?

We can turn etags-xref-find-definitions-tag-order into a defcustom, with descriptions of what every possible element means. Problems:

1) I have hard time imagining how we're going to have descriptions for both tag-exact-match-p and tag-implicit-name-match-p that are different and make sense to the user.

2) The user will have to find out about etags-xref-find-definitions-tag-order first anyway.

Or we could add a custom variable to xref with a higher-level meaning... that would require support from backends, then.

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