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bug#25181: 25.1.90; move-beginning-of-line doesn't move point

From: Andreas Röhler
Subject: bug#25181: 25.1.90; move-beginning-of-line doesn't move point
Date: Tue, 13 Dec 2016 10:25:32 +0100
User-agent: Mozilla/5.0 (X11; Linux i686; rv:45.0) Gecko/20100101 Icedove/45.4.0

On 12.12.2016 17:53, Eli Zaretskii wrote:
From: Andreas Röhler <address@hidden>
Date: Mon, 12 Dec 2016 12:49:05 +0100

Bug does not appear with Emacs -Q, as some fontification in buffer seems
to trigger it.

Text in buffer:

git reset HEAD test/2.sh

Cursor at pos 16. i.e. beginning of word "test".

C-a doesn't move point.
Please show a complete recipe, starting from "emacs -Q" (and loading
any optional packages/customizations as needed).  It's hard to discuss
an issue without being able to test-drive it.

Watching move-beginning-of-line edebug, at line 6415

      (skip-chars-backward "^\n")

jumps correctly to BOL.

Error results from following later on:

      (setq first-vis-field-value
        (constrain-to-field first-vis orig (/= arg 1) t nil))

Here first-vis-field-value is set to orig, i.e. pos 16, where it jumps
back-to, not leaving point at BOL.
I'm not sure I understood, but if I did, this is a feature: functions
such as beginning-of-line stop moving at field boundaries.

Hmm, is this reasonable? BOL is a very basic concept. Don't think it should be permitted to be interfered with fields.

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