Enable liblouis multi pass (disable pass1only flag) with a hidden config parameter

[LeonarddeR]

Link to issue number:

Provides test possibilities for #7301
Provides a workaround for #7693

Summary of the issue:

We currently use pass1only for liblouis translation, as not providing this flag and thus using multi pass theoretically breaks input to output position mapping.

Description of how this pull request fixes the issue:

Adds outputPass1Only to the braille section of the configuration. This is not visible in the GUI. You can change this by running this from a python console

import config; config.conf["braille"]["outputPass1Only"]=False

Change it back with

import config; config.conf["braille"]["outputPass1Only"]=True

Testing performed:

I will provide a try build for this later today.

Known issues with pull request:

None, except it is a bit difficult to change this for non-power users.

Changes entry

• Changes for developers
  • Added a hidden boolean flag to the braille section in the configuration: "outputPass1Only". (Disable pass1only for liblouis braille output #7301, Urgent: Please add option to enable multi-pass mode for Liblouis under settings/Braille #7693, Enable liblouis multi pass (disable pass1only flag) with a hidden config parameter #7702)
    • This flag defaults to true. If false, liblouis multi pass rules will be used for braille output.

[michaelDCurran]

I think there is a typo in the python console command. One of them should be true?

[michaelDCurran]

I pushed a try build. If this succeeds, I'll incubate.

[LeonarddeR]

@michaelDCurran commented on 26 okt. 2017 07:03 CEST:

I think there is a typo in the python console command. One of them should be true?

Yuck, fixed that.

[LeonarddeR]

@michaelDCurran: Is this still in your view for 2017.4? Note that this can be even merged with a new what's new entry for developers, as these are not part of the translations.

[michaelDCurran]

Sorry, I should have merged this much earlier. I'm not going to include this in 2017.4, but it is already available in Next snapshots, and I can get it into master as soon as we branch for rc (today). So there are plenty of ways people can test this out.