Fix search in Output panel to exclude filtered/hidden lines

[Copilot]

Description

When filters are applied in the Output panel (hiding lines by log level, category, or text), search still finds matches in hidden lines, showing inflated counts and navigating to invisible results.

Changes

Wraps the text model's findMatches method in FilterController to filter out matches that intersect with hidden areas:

• Intercepts search requests when model is attached to Output editor
• Filters matches using Range.areIntersecting() against hiddenAreas
• Handles both overloaded findMatches signatures via runtime type check
• Restores original method on model disposal via modelDisposables

// In FilterController.onDidChangeModel()
const originalFindMatches = model.findMatches.bind(model);
model.findMatches = ((searchString, rawSearchScope, ...) => {
    const allMatches = typeof rawSearchScope === 'boolean'
        ? originalFindMatches(searchString, rawSearchScope, ...)
        : originalFindMatches(searchString, rawSearchScope, ...);
    
    return allMatches.filter(match => {
        return !this.hiddenAreas.some(hiddenArea => 
            Range.areIntersecting(match.range, hiddenArea)
        );
    });
}) as typeof model.findMatches;

Search now returns only visible matches, with accurate counts and navigation isolated to the Output panel.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Search in Output pane shouldn't find invisible items that are hidden due to filter</issue_title>
<issue_description>Using a filter, one can filter down Output pane contents to only specific log statements. However, searching still "finds" invisible results.

https://github.com/user-attachments/assets/756f8030-a44b-4288-bfd2-12b3ce44d4fc</issue_description>

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

• Fixes Search in Output pane shouldn't find invisible items that are hidden due to filter #287128

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.