Evaluate the following and you will see what I mean:
(setq header-line-format "Here is a tab:[\t].")
The result in the new version is that "^I" is displayed, in
blue text, in the buffer header line, while previously it
was displayed as a whitespace.
This must be due to this code in xdisp.c:
else if ((it->c < ' '
&& (it->area != TEXT_AREA
/* In mode line, treat \n like other crl chars. */
|| (it->c != '\n'
&& it->glyph_row && it->glyph_row->mode_line_p)
|| (it->c != '\n' && it->c != '\t')))
If we change that to
else if ((it->c < ' '
&& (it->area != TEXT_AREA
/* In mode line, treat \n like other crl chars. */
|| (it->c != '\t'
&& it->glyph_row && it->glyph_row->mode_line_p)
|| (it->c != '\n' && it->c != '\t')))
does that give the right results?
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