bug#53729: 29.0.50; Tamil text not shaped in modeline

[Eli Zaretskii]

> From: Visuwesh <visuweshm@gmail.com>
> Cc: 53729@debbugs.gnu.org
> Date: Tue, 15 Feb 2022 07:17:12 +0530
> 
> > Looks like the rendering of the file name is affected by the non-Tamil
> > text that follows it?
> >
> 
> And it looks like it is not just any non-Tamil text that affects it but
> only image like extensions?  For example, if the extension is .txt, .sh,
> .c, .el, .svg, .djvu, then the buffer name is shaped properly.  But if I
> use the extensions .tiff, .png, .jpeg, .pdf, .jpg, then the buffer name
> is not shaped.  The file I renamed was a bash script.

The display code which renders this doesn't know anything about the
meaning of the extensions, it only cares about the characters it needs
to display.  So if image-file extensions tend to cause this, it's
because of the characters that are part of the extensions, or maybe
because having an image file visited by the buffer affects the mode
line in some other way that causes this issue.

> > But I cannot reproduce this on my system, so it is hard to tell what
> > is going on here.
> 
> That is really unfortunate.

Maybe someone else can reproduce this?