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bug#16497: 24.3.50; `move-to-column' ignores invisible text at the begin


From: Eli Zaretskii
Subject: bug#16497: 24.3.50; `move-to-column' ignores invisible text at the beginning of the line, which create problems when using string-rectangle
Date: Mon, 20 Jan 2014 17:38:41 +0200

> From: Bastien <address@hidden>
> Cc: address@hidden
> Date: Mon, 20 Jan 2014 10:22:02 +0100
> 
> emacs -Q
> M-: (insert "abc") RET
> C-a
> M-: (put-text-property (point) (1+ (point)) 'invisible t) RET
> M-: (move-to-column 0)
> 
> The point is between the invisible character and "b", which
> feels wrong even in terms of interactively inserting text.

Thanks.

move-to-column is a screen-moving command, and it has been skipping
invisible text for the past 18 years.  It also accounts for various
other display-only features and artifacts.  (It is a pity that this is
not documented; I think it's a documentation bug.)

So now I'm wondering why you thought you should be using this
function, if what you need is (AFAIU) to get to the Nth character
starting from the beginning of a line.  E.g., move-to-column also
accounts for double-width characters (it counts them as 2 columns),
and also for how composed characters are displayed (it could count N
composed characters as M ~= N columns).  It also accounts for
characters displayed via display tables.  Are you sure you want all
this in the job you need to do with the rectangle?

Or maybe you just want line-move-to-column.





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