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bug#16413: 24.3.50; Inconsistent behavior of text property functions in


From: Daniel Colascione
Subject: bug#16413: 24.3.50; Inconsistent behavior of text property functions in narrowed buffer
Date: Sat, 11 Jan 2014 00:03:42 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0

On 01/11/2014 12:01 AM, Eli Zaretskii wrote:
Date: Fri, 10 Jan 2014 20:05:33 -0800
From: Daniel Colascione <address@hidden>

On 01/10/2014 07:05 PM, Nathan Trapuzzano wrote:
The various functions for examining text properties behave unintuitively
and incosistently at (point-max) on narrowed buffers.  Rather than
returning `nil', they return the prop(s) of the text at (point-max),
even though the text is not actually visible in the buffer, due to
narrowing.  By contrast, `char-after' always returns `nil' when passed
(point-max).  It seems to me the text property functions should also
return `nil', as they do at (eobp) on widened buffers.

I agree that this behavior is unintuitive, but I wonder whether we can
fix this bug without breaking existing elisp.

I don't even agree it's not intuitive: in the eob case there's nothing
at point-max, while in a narrowed buffer there's a character there.
Narrowing is not documented to make the text outside the region to
magically disappear, it just prevents point from moving there.

Narrowing *is* generally useful for treating part of a buffer as a consistent unit, though, especially when that part is syntactically different from the rest of the buffer.





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