Is it possible to use a Smart Search Filter with query string parameters and not doing a postback or going through the Smart Search Dialog?
Yes.
You need to use macro, for example: +_content:({%QueryString["searchtext"]|(identity)GlobalAdministrator%})
+_content:({%QueryString["searchtext"]|(identity)GlobalAdministrator%})
Technically speaking the smart search dialog uses a redirect not a postback. So it redirects to the same page and adds the URL params to the page.
Thank You!
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