Source locale doesn't respect locale inheritance mode

[mfendeksilverstripe]

Module version(s) affected

7

Description

getSourceLocale() is supposed to give you the locale which the content is coming from for a specific model but it doesn't take into account locale inheritance mode which is a model level setting.

How to reproduce

Apply INHERITANCE_MODE_EXACT to a model (for example a campaign page). Let's assume this test setup:

• English locale (global default)
• German locale (falls back to English locale)
• test page is localised only in English locale
• check the source locale for this page in German locale

Expected source locale

null (no source)

Actual source locale

English locale

Validations

• Check that there isn't already an issue that reports the same bug
• Double check that your reproduction steps work in a fresh installation of silverstripe/installer (with any code examples you've provided)

PRs

• FIX: Source locale indicator correction. #840