Edit settings for language should preserve settings search input

[isidorn]

Testing #145588

1. Open settings ui. Type editor.wordwrap
2. Click on the "Edit settings for markdown" button
3. Search is now @lang:markdown
4. It should be @lang:markdown editor.wordwrap. Thus my input should be preserved

fyi @sandy081

[rzhao271]

For step 2, I assume you ran the workbench.action.configureLanguageBasedSettings command and then selected "markdown" from the quickpick?

Also, if I type a query into the Settings editor, then switch to a different tab, and then run that command and select a language, it will focus back into the Settings editor. But, at that point, I'm not sure whether we should preserve the old query or replace it completely. I also assume this is the more common use case, because we now have a funnel button in the Settings editor search widget that one can use to append a language filter to the query.

[isidorn]

No, for step 2 I clicked on the following button / link

[rzhao271]

Verification steps: #145711 (comment)
Also see #145711 (comment)

I also confirmed that the markdown setting shows up there in the first place because an extension has contributed a markdown-specific default override for the editor.wordwrap setting. After clicking on the "Edit settings for markdown" link, we currently don't show the default override indicator, which is a known issue that is being tracked separately.