Add Technotes/Bugs folder and MacStateRestoration.md file. Starting to move things like this out of my personal notes and into the repo.

Technotes/Bugs/MacStateRestoration.md

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+# Mac State Restoration
+
+https://github.com/Ranchero-Software/NetNewsWire/issues/4589
+
+https://github.com/Ranchero-Software/NetNewsWire/issues/4631
+
+## State to restore
+
+Hide Read Articles
+Hide Read Feeds
+Windows positions, including split view positions
+
+## Warnings
+
+	WARNING: Secure coding is automatically enabled for restorable state! However, not on all supported macOS versions of this application. Opt-in to secure coding explicitly by implementing NSApplicationDelegate.applicationSupportsSecureRestorableState:.
+
+## How state restoration works according to Apple
+
+Info.plist: NSApplicationSupportsRestorableState - true
+
+NSUserInterfaceItemIdentification
+
+NSWindowRestoration Protocol
+window.restorationClass = …
+
+encodeRestorableStateWithCoder:
+restoreStateWithCoder:
+
+self.restorationIdentifier = "MainWindowController"
+
+AppDelegate — application:shouldRestoreApplicationState: and application:shouldSaveApplicationState: for complex cases
+
+Can be turned on and off via system pref
+
+## Tests
+
+Window 1
+Restore position — yes
+Restore split view position — sometimes
+Restore timeline position — no
+Restore Hide Read Feeds — yes
+Restore Hide Read Articles for inessential — yes
+
+Window 2
+Restore position
+Restore split view position
+Restore Hide Read Feeds
+Restore Hide Read Articles for The Verge
+
+Restores second window but not first
+
+With state restoration enabled, all three windows appear, but with not everything restored
+
+---
+
+Close windows tests
+
+1 window
+detail scroll not restored