Very similar to move up/down flag problem fixed here - https://github.com/discourse/discourse/pull/28272
Those are the steps to toggle the flag:
1. click toggle - `saving` CSS class is added;
2. request to backend;
3. `saving` CSS class is removed.
And check if the flag was toggle was:
```ruby
def has_saved_flag?(key)
has_css?(".admin-flag-item.#{key}.saving")
has_no_css?(".admin-flag-item.#{key}.saving")
end
```
If the save action is very fast, then the saving class is removed before the first check.
Therefore I decided to invert it, and once action is finished add `saved` CSS class.
Then we can have a quick positive check:
```ruby
def has_saved_flag?(key)
has_css?(".admin-flag-item.#{key}.saved")
end
```
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