bug#36967: 27.0.50; Duplicate lines in xref output

[Dmitry Gutov]

On 09.12.2020 05:53, Dmitry Gutov wrote:
> Using xref-file-location-column there kind of breaks the abstraction. I 
> was thinking more along the lines of text-prop search for the column 
> inside the summary string:

Although we'll probably make it an optional method, just like 
xref-location-line is already.

Then we won't have to do all that gymnastics with the temp buffer.