[Settings] Implement singleton pattern for ShortcutConflictWindow

[Copilot]

Summary

Fixes issue where multiple ShortcutConflictWindow instances could be opened simultaneously. The window now follows the same singleton pattern as OobeWindow - only one instance can exist at a time, and attempting to open another brings the existing window to the foreground.

Changes

Implemented singleton management for ShortcutConflictWindow following the established pattern used by OobeWindow:

App.xaml.cs

• Added static field to store the singleton window instance
• Added GetShortcutConflictWindow(), SetShortcutConflictWindow(), and ClearShortcutConflictWindow() methods for lifecycle management

ShortcutConflictWindow.xaml.cs

• Updated WindowEx_Closed event handler to call App.ClearShortcutConflictWindow() to properly clean up the singleton reference when the window is closed

Updated all three entry points that create ShortcutConflictWindow:

• ShortcutConflictControl.xaml.cs (Dashboard conflict warning)
• ShortcutControl.xaml.cs (Settings page shortcut controls)
• OobeOverview.xaml.cs (OOBE overview page)

Each location now checks if a window already exists using App.GetShortcutConflictWindow():

• If no window exists, creates a new one and registers it via App.SetShortcutConflictWindow()
• If a window already exists, simply calls Activate() to bring it to the foreground

Testing

The fix ensures that:

• ✅ Only one ShortcutConflictWindow can be open at a time
• ✅ Clicking the shortcut conflict button when a window is already open activates the existing window instead of creating a duplicate
• ✅ The window reference is properly cleared when closed, allowing a new instance to be created in future interactions

Fixes #[issue_number]

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>[Settings] Single Shortcuts Conflicts window</issue_title>
<issue_description>### Microsoft PowerToys version

0.95.0

Installation method

GitHub

Area(s) with issue?

Settings

Steps to reproduce

Multiple shortcut conflicts window can be launched.
Should have the same behavior of OOBE window.
If shortcut conflicts window is already opened, pressing the button should bring the window in foreground.

✔️ Expected Behavior

Single shortcuts conflicts window

❌ Actual Behavior

Multiple shortcut conflicts window can be launched

Additional Information

No response

Other Software

No response</issue_description>

<agent_instructions>Settings ShortcutConflictWindow should have the same behavior of OobeWindow.
When ShortcutConflictWindow is already opened, activate that window instead of opening another one. </agent_instructions>

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

Fixes #42437

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[davidegiacometti]

Code LGTM! 🚀

I pushed some minor changes and also ported 2 small features from the OOBE window:

• React to theme change
• Close PT Settings process when Shortcuts Conflicts is the last window being closed

Tested Shortcuts Conflicts window opening from:

• Dashboard
• OOBE window
• Shortcut control

[vanzue]

Followed the same pattern as #44721 after it's merged, so we got unified oobe, scoobe, and shortcutconflict secondary layer window management

[Copilot]

Pull request overview

Implements single-instance behavior for the Settings “Shortcut conflicts” window so repeated entry points activate the existing window instead of opening duplicates, aligning the UX with other secondary windows (e.g., OOBE/SCOOBE). It also adds disposal/guard logic around the Dashboard view model lifecycle.

Changes:

• Added singleton-style management for ShortcutConflictWindow in App, and updated callers to use it.
• Updated ShortcutConflictWindow to integrate with theme changes and to clear singleton state on close.
• Added disposal handling and _isDisposed guards in DashboardViewModel, and disposes the VM when DashboardPage unloads.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/settings-ui/Settings.UI/ViewModels/DashboardViewModel.cs	Adds _isDisposed guarding and updates Dispose() behavior.
src/settings-ui/Settings.UI/SettingsXAML/Views/DashboardPage.xaml.cs	Disposes the dashboard VM on Unloaded.
src/settings-ui/Settings.UI/SettingsXAML/MainWindow.xaml.cs	Uses the renamed App.IsSecondaryWindowOpen() check.
src/settings-ui/Settings.UI/SettingsXAML/Controls/ShortcutControl/ShortcutControl.xaml.cs	Routes “Learn more” to the singleton conflict window opener.
src/settings-ui/Settings.UI/SettingsXAML/Controls/Dashboard/ShortcutConflictWindow.xaml.cs	Hooks theme changes and notifies App on close for singleton cleanup.
src/settings-ui/Settings.UI/SettingsXAML/Controls/Dashboard/ShortcutConflictControl.xaml.cs	Routes dashboard conflict button to the singleton conflict window opener.
src/settings-ui/Settings.UI/SettingsXAML/App.xaml.cs	Adds tracking/opening logic for the singleton ShortcutConflictWindow and expands “secondary window” detection.

Comments suppressed due to low confidence (1)

src/settings-ui/Settings.UI/ViewModels/DashboardViewModel.cs:855

• DashboardViewModel.Dispose() now gets called (via DashboardPage.Unloaded), but it only unsubscribes its own SettingsChanged handler. The contained QuickAccessViewModel also subscribes to _settingsRepository.SettingsChanged and enabled-module notifications and currently has no Dispose/unsubscribe path, so disposing the dashboard won’t actually stop those subscriptions/work. Either avoid disposing the DashboardViewModel on navigation, or add cleanup for QuickAccessViewModel (e.g., implement IDisposable there and call it here).

        public override void Dispose()
        {
            if (_isDisposed)
            {
                return;
            }

            _isDisposed = true;
            base.Dispose();
            if (_settingsRepository != null)
            {
                _settingsRepository.SettingsChanged -= OnSettingsChanged;
            }

[vanzue]

/azp run

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