Description:
Recently (post-7.0?) Help->LibreOfficeDevHelp results in

   Could not find Help page (404).
   That is an error. Possible causes are:
       The page does not exists and must be created.
       The page exists, but the Help ID is wrong or missing.
   Use the Module, Contents, Index and Search selectors to find the right page.
   The following data could be helpful in locating the error:
   Help ID: .uno:HelpIndex

The browser's Address bar contains
file:///path/to/instdir/opt/libreofficedev7.1/help/en-US/text/shared/05/err_html.html?System=UNIX&DbPAR=WRITER&HID=.uno:HelpIndex

(that file exists).

I am running a "parallel installation" as described in https://wiki.documentfoundation.org/Installing_in_parallel/Linux
(In summary: Download the main and helppack .tar.gz files, and for each untar into a temp directory and then, for each .deb file, do
  dpkg-deb -x <file.deb> /path/to/installdir
)

I'll attach a simple download-and-install script which reproduces my installation.

This regression seems to have happend in the 7.x branch (I think 7.1, not sure).  The 6.x builds do not have this problem.

Steps to Reproduce:
1. Run the attached installer script (or equivalent) to make a "parallel installation" from the deb main and helppack (en-US) tar files.

2. /path/to/installdir/opt/libreoff*/program/soffice --writer  # or --draw

3. Help->LibreOfficeDevHelp

Actual Results:
The above 404 error appears in a browser

Expected Results:
Glorious documentation


Reproducible: Always


User Profile Reset: Yes



Additional Info:
.