The incremental searching is often too rapid to be useful in the Web Inspector. We should wait a fixed amount of time typing stops. This might let us remove the 3 character minimum. The wait time could be inverse to the search query length too. Shorter string have a longer delay, so the use can type more. As the string gets longer the delay could shorten. We might just want to ditch using WebCore's concept of incremental. Or consider this for all input search fields.
Closing as invalid, as this bug pertains to the old inspector UI and/or its tests. Please file a new bug (https://www.webkit.org/new-inspector-bug) if the bug/feature/issue is still relevant to WebKit trunk.