1. Feature request - field where to place the translated title.
2. Bugreport - for translatable pages with disabled title translation, Special:PageMigration currently is hide _first_ translation unit

Maybe (1) leads to fix (2) automatically. But maybe not a leads...

Thanks for the testing.

Bugreport - for translatable pages with disabled title translation, Special:PageMigration currently is hide _first_ translation unit

This should definitely be fixed and would be high priority if such pages weren't rather rare.

As for the feature request, I find a limited benefit in it because in most cases the title will need to be filled manually, if at all, as you can already do in Special:Translate itself. But it's ok to have an additional text area if that helps fixing the bug.

Reported here today.
Is there a way to show all the translation units if the title translation is disabled? Shouldn't there be some code that tells if it is enabled or disabled? If there is, can it be used to determine if the first translation unit should be hidden or not?

This should definitely be fixed and would be high priority if such pages weren't rather rare.

@Nemo_bis - this is for all templates, as example... And generally for many includable subpages.

@Nemo_bis I think I found source of the problem. ext.translate.special.pagemigration.js#L145 for loop in getSourceUnits function starts from 1, but arrays are zero-based so it will always skip first translation unit, whether it is displayTitle or regular one, resulting in mentioned bug.

Changing it to i = 0 fixes the problem and also adds a field for translating title as part of feature request.
If page was translated with option Allow translation of page title, unit for pageTitle will be loaded so user can fill it manually or add empty unit an leave it like that for future Special:Translate. The problem could be that there will be no information that it is title but it should be obvious or mentioned in docs for now.

@Nikerabbit
After this fix, third point in Help:Extension:Translate/Page_translation_administration#Tips will need adjustments. Not sure if this should be added as a separate task.

@Kaganer

Maybe (1) leads to fix (2) automatically. But maybe not a leads...

Actually fix from (2) leads to (1) ;)

@Goraf, Thanks!

@Goraf Your explanation of this seems to be right. Do you have any plans to continue working on this? Maybe to provide a patch?

@Phantom42, I have no environment set for this right now. Feel free to take it. I already did what I could

Change 405534 had a related patch set uploaded (by Phantom42; owner: Phantom42):
[mediawiki/extensions/Translate@master] Fix PageMigration not showing field for first translation unit

https://gerrit.wikimedia.org/r/405534

Change 405534 merged by jenkins-bot:
[mediawiki/extensions/Translate@master] Fix PageMigration not showing field for first translation unit

https://gerrit.wikimedia.org/r/405534