bug#35119: 26.1; narrow-to-region loses word-start/symbol-start information at end

[Eli Zaretskii]

> From: Sam Halliday <sam.halliday@gmail.com>
> Date: Wed, 03 Apr 2019 12:19:08 +0100
> 
> If the function `narrow-to-region' (as it is in `looking-back') is used
> to restrict the region prior to an invocation of re-search-forward or
> looking-at, then zero length regexp patterns are lost at the boundaries.

Could you please provide a recipe to reproduce the issue?  I'm not
sure I understand what is the problem you are describing.

Thanks.