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Subject: bug#68441: Fix the unaligned tab in whitespace mode
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As described in the commit message, this patch is meant to fix the unaligne=
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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Young Arto <jifengsi@HIDDEN>
Subject: bug#68441: Acknowledgement (Fix the unaligned tab in whitespace mode)
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Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#68441: Fix the unaligned tab in whitespace mode
Resent-From: Eli Zaretskii <eliz@HIDDEN>
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From: Eli Zaretskii <eliz@HIDDEN>
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 (message from Young Arto on Sat, 13 Jan 2024 12:23:27 +0000)
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> From: Young Arto <jifengsi@HIDDEN>
> Date: Sat, 13 Jan 2024 12:23:27 +0000
> msip_labels: 
> 
> There is a bug in whitespace mode which used the display table to
> replace a tab with a tab-mark vector.
> 
> If we has a line like this:
> ------
> 123\t5678
> ------
> 
> If tab-width is 4 and tab-mark is [?> ?\t],
> The line will be displayed as following:
> (we use '^' to represent tab extra spaces)
> ------
> 123>^^^^5678
> ------
> 
> However, it should be displayed as:
> ------
> 123>5678
> ------

I'm not sure I agree.  We never display a TAB as nothing, no matter if
it comes from a display vector or from a buffer or from any other
source.

So this patch changes long-standing behavior in non-trivial ways, and
I'm not sure what it can break, after so many years.  I understand
that it makes certain customizations in whitespace-mode look better on
display in some cases, but display-tables are used in Emacs not just
in whitespace-mode.

Thanks.

Last modified: Sat, 20 Jan 2024 12:30:02 UTC

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