Fix deprecated setting not disappearing after reset in Settings editor

[Copilot]

Fixes #252102

Resetting a deprecated setting via the gear menu's "Reset Setting" action would not remove it from the Settings editor. The user had to clear and re-enter the search query for the setting to disappear.

Root cause: refreshSingleElement was checking element.isConfigured without first updating the element's state from the configuration service. After a reset, the element still had stale state showing isConfigured = true.

Fix: Call element.inspectSelf() before checking isConfigured to update the element's state to reflect the current configuration. Then, when a deprecated setting is found to be unconfigured, call refreshTree() to rebuild the tree and remove it (which already excludes unconfigured deprecated settings in settingsTreeModels.ts).

private refreshSingleElement(element: SettingsTreeSettingElement): void {
    if (this.isVisible() && this.settingsTree.hasElement(element)) {
        // Update the element's state to reflect the current configuration
        element.inspectSelf();
        if (!element.setting.deprecationMessage || element.isConfigured) {
            this.settingsTree.rerender(element);
        } else {
            // Deprecated and no longer configured - refresh tree to remove it
            this.refreshTree();
        }
    }
}

Original prompt

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This section details on the original issue you should resolve

<issue_title>Unable to reset deprecated setting in the UI</issue_title>
<issue_description>I have chat.tools.terminal.shellIntegrationTimeout set to 200 on Insiders. This is a deprecated setting.

1. Open the Settings editor.
2. Search "shell integration".
3. See a deprecation warning for chat.tools.terminal.shellIntegrationTimeout. Select the setting.
4. Click the gear icon on the top-left of the setting and select Reset Setting.
5. 🐛 The setting does not disappear from the editor. I have to clear the search query and search "shell integration" again for the setting to stop showing up.</issue_description>

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

• Fixes Unable to reset deprecated setting in the UI #275861

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[rzhao271]

@copilot refreshTree still seems to render the deprecated setting even after it has been reset. The fix is more likely to be in the part of the code that decides which settings get rendered or added to the tree.

[Copilot]

@copilot refreshTree still seems to render the deprecated setting even after it has been reset. The fix is more likely to be in the part of the code that decides which settings get rendered or added t...

You're right. The issue was that element.isConfigured still had the stale value (true) because the element hadn't been updated after the reset. Added a call to element.inspectSelf() before checking isConfigured to update the element's state from the configuration service. Fixed in ab9bef6.