The added stuff at the ConfigWidget looks to me not perfect but OK. Suggestions are welcome. Some thoughts/questions

• Most UI member are named m_foo but some without the m_ prefix. I can't recognize a rule why and chose for my new stuff a name without the prefix due to the way how they are used later, by ui-dot (ui.foo). So my offer is to rename all uniform, let me know which you prefer
• The DictionaryComboBox and the new QListWidget (languageList) is somehow reduntant. Would be nice to include the "default language information" into the languageList. But how? The only idea I had was to add an icon to the "default language" by a double click.
• Changes at the selected languages appear not direct in the DictionaryComboBox, only at next run. The same rules to the list itself. It would be a little unsettled to reorder the list by each change.
• Not investigated if in Settings::setPreferredLanguages is calling d->loader->changed() is needed. Guess it is, but why not in every setFoo function?

Bug302689 - Impossible to delete unwanted dictionaries
https://bugs.kde.org/show_bug.cgi?id=302689

Does not quite fit, but relieves the symptoms. Enough to close that?

Frameworks Ping! (?)

I think this makes sense, it improves the usability of the dictionary selection.
I see no API issues, should be BC and docs are there, too.

In D17030#373912, @cullmann wrote:

Ah, one thing: Could you add some @since 5.xxx to the new function in speller.h?

Only in speller? In settings_p.h are also two new, but there was no docu, so I also wrote nothing, but could

I assume 5.54 would be the right one.

In CMake it's currently KF5_VERSION 5.53.0 so 5.54 is the right one?

In D17030#373994, @loh.tar wrote:

In D17030#373912, @cullmann wrote:

Ah, one thing: Could you add some @since 5.xxx to the new function in speller.h?

Only in speller? In settings_p.h are also two new, but there was no docu, so I also wrote nothing, but could

I think only speller.h is installed as public API, yes.

I assume 5.54 would be the right one.

In CMake it's currently KF5_VERSION 5.53.0 so 5.54 is the right one?

I think so.

Um, I'm bit confused when I now look at the diff 1/2 here???