Navigation breaks after system sleep/resume - pages load indefinitely

[bnema]

Bug Description

After the system goes to sleep and resumes, if dumber browser was open, navigation (both within a site and to external sites) stops working. Pages load indefinitely and the browser must be restarted to recover.

Observed while browsing github.com on a laptop.

Root Cause Analysis

After investigating the codebase, the issue is that dumber has no handling for system sleep/wake events. Several potential causes:

1. No Sleep/Wake Event Listening

The application doesn't know when the system goes to sleep or wakes up. There's no listener for:

• org.freedesktop.login1.Manager.PrepareForSleep(bool going_to_sleep) D-Bus signal

2. Stale Network/WebKit State

After resume:

• WebKit network sessions may hold stale connections
• DNS cache may be invalid
• TLS sessions may have expired
• The NetworkSession in internal/infrastructure/webkit/context.go is created once and never refreshed

3. No Web Process Crash Recovery

If WebKit's web process becomes unresponsive after sleep, there's no handling:

• No web-process-crashed or web-process-terminated signal handlers
• No automatic reload or error page mechanism

Current Related Code

• internal/infrastructure/idle/portal_inhibitor.go - Only prevents sleep (for video playback), doesn't react to sleep/wake
• internal/infrastructure/webkit/context.go - Single shared NetworkSession, no refresh mechanism
• internal/infrastructure/webkit/webview.go - No web process crash signal handlers

Proposed Solutions

Option A: Listen for PrepareForSleep (Recommended)

1. Add D-Bus listener for org.freedesktop.login1.Manager.PrepareForSleep
2. On wake (PrepareForSleep(false)):
   • Optionally trigger page reload for active tabs
   • Or at minimum, log the event for debugging

Option B: Add Web Process Crash Handling

1. Connect to WebKit's web-process-terminated signal
2. Show error page with reload option when web process dies
3. Optionally auto-reload

Option C: Network State Monitoring

1. Monitor org.freedesktop.portal.NetworkMonitor for connectivity changes
2. Refresh stale connections after network returns

Workaround

Restart the browser after system resume.

Environment

• Linux laptop with system sleep/hibernate
• Site: github.com (but likely affects all sites)