Focus-android: Cannot Add Custom Search Engine in Firefox Focus

[st3fan]

Copied from https://bugzilla.mozilla.org/show_bug.cgi?id=1590327

Steps to reproduce:

Add Custom Search Engine in Firefox Focus. I tried to add MetaGER with string "https://metager.de/meta/meta.ger3?focus=web&encoding=utf8&lang=all&eingabe=%s".

Actual results:

Is does not appear in the list of search engines. If I try to add the same again, Firefox tells me that there is an existing search engine with this name.

Expected results:

Should appear in the list of search engines and should be selectable.

[woodruffandtheschnibbleofazimuth]

I have the same issue also on the last version of Firefox Focus.

[goforbg]

Same issue still persists, turns out it turns up only after an app restart.
The language code is beautifully written to update when Shared Preferences are changed, but I think the CustomSearchEngineProvider.kt class runs only once during startup and that's why the list isn't updated. I'm trying to solve this, will post an update here soon.

[srustamo]

Same issue still persists, turns out it turns up only after an app restart.

I don't see the newly added search engine even after a restart. v 8.11.1

[tkbremnes]

The search engine appears on _device_ restart on my phone.

[davhel]

Duplicate of #4394
I can also reproduce the issue on android 7.1.1. using v8.12.0
Removal of queries is affected as well

@zhuperman opened a pull request to fix this issue but it never got merged
https://github.com/mozilla-mobile/focus-android/pull/4487