Fix settings editor double render when opening with filter

[Copilot]

Settings editor with a filter query (e.g., @tag:accessibility) rendered all settings briefly before applying the filter.

Root Cause

setInput → _setOptions sets search widget value (debounced search) → onConfigUpdate renders unfiltered tree → debounced search fires → re-render with filter.

Changes

In onConfigUpdate, trigger search synchronously before initial render when:

• Search widget has a value
• No search result model exists yet
• Not in recursive call (new skipInitialSearch guard)

if (!skipInitialSearch && this.searchWidget.getValue() && !this.searchResultModel) {
    await this.onSearchInputChanged(true);
    return; // Skip unfiltered render
}

Recursion guard prevents infinite loop when triggerSearch calls onConfigUpdate to rebuild tree for advanced filter changes.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Settings: Opening settings editor with a filter will render settings twice</issue_title>
<issue_description>1. Run Preferences: Open Accessibility Settings

🐛 Settings editor opens and gets a 2 stage render: first all settings are displayed, then it filters down to only accessibility settings. This happens every time the settings editor opens anew, scoped to a particular filter.

https://github.com/user-attachments/assets/d2af5a62-fd1c-47b5-b7ca-8a37d7cfb429</issue_description>

<agent_instructions>In src\vs\workbench\contrib\preferences\browser\settingsEditor2.ts, check whether the editor can apply all filters first before rendering.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Settings: Opening settings editor with a filter will render settings twice #268860

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