Please see below proposal to restore the previous default behavior

In D26342#675142, @dfaure wrote:

This actually breaks language auto-detection for me in the KMail composer.

Testcase:

• New Mail
• I type "Bonjour," in the body
  
  Before: It's detected as French and not underlined as a typo
  
  After: The language remains English, and the word is underlined as a typo
  
  Workaround: Tools / Spelling / change language from English to French
  
  Too bad I'm realizing this is the reason for the regression only today (day of 5.71 release) by looking at the KF-5.71 changelog :(

In R456:d52726681d26753e2f80d72a29ad0cb2f52584b0#3897394, @pino wrote:

@sdepiets bumping dependencies in a stable branch is against the freeze policy:
https://community.kde.org/Schedules/release_service/20.04_Release_Schedule#Thursday.2C_March_12.2C_2020:_20.04_Dependency_Freeze

what is the reason for this version bump (also for master)?

In D29376#663950, @mthw wrote:

If everything is fine, can you land this, please? Also, could this go into 20.04?

In D29376#663903, @mthw wrote:

So, should it be before or after the constructor? Multiple apps already use it before.

Sorry I thought you had changed to app. that kwallet is using for instance instead of the static method

Sorry I thought I had sent my comments but I didn't submit
Please see above

Bump since + autotest checks the language as well

• Merge branch 'master' of git.kde.org:sonnet

In D26342#623729, @aacid wrote:

Would it make sense to enshrine this behaviour with an autotest?

I don't see a use case where you would want to set the Language, but then let the system override it (and only if the user has auto-detection).
I left the option in the API to "setAutoDetectLanguageDisabled" to false, for instance if you are not sure which language is being used anymore and want to let the system re-decide by itself.

Disable autodetect on language change