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Re: I can see invisible characters
From: |
Stefan Monnier |
Subject: |
Re: I can see invisible characters |
Date: |
Thu, 21 May 2009 10:05:56 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.0.93 (gnu/linux) |
>> I see the same thing: the char is not displayed.
> I'm confused. The first lines are
> 1 Aachen;Aa·chen
> 16 Aachener;Aa·che·ner
> 36 Aachenerin;Aa·che·ne·rin
> 61 Aachenern;Aa·che·nern
> 83 Aacheners;Aa·che·ners
> 105 Aachens;Aa·chens
> 122 Aadorf;Aa·dorf
> 137 Aalbauer;Aal=bau-er
> My code calls `add-text-properties' with the following start and end
> values:
> 1 16
> 16 36
> ...
> 122 137
> As you can see, the positions overlap.
The positions are *between* chars, so the positions themselves have
a width of 0, so the interval 1-16 and 16-36 do not overlap.
> If I don't do this, I get empty lines.
Of course, because otherwise they don't cover the newlines.
> However, I really don't understand the whole issue! The
> last character in the first line has position 14,
14 is the position before the last char.
> thus the end-of-line character has position 15
Indeed, 15 is the position after the last char, aka before the newline.
> -- why do I need to use position 16 to make
> the first line completely disappear?
Because 15-16 is the interval that covers the newline.
> Note that, according to the info of `C-x =', I can't access position
> 138, the first visible character after applying my code. This *can't*
> be right IMHO.
That doesn't sound right: the first visible position is the char on
interval 137-138. So you should not be able to access position 137
(because the invisible&intangible interval 1-137 is rear-sticky, so you
can place point at its beginning but not at its end), but you should be
able to go to position 138 (between the A and the a of Aalbauer).
Stefan