Merge branch 'develop' into feature/vault-format-8

# Conflicts:
#	main/pom.xml
#	main/ui/src/main/resources/license/THIRD-PARTY.txt
[ci skip]

main/commons/src/main/java/org/cryptomator/common/keychain/KeychainManager.java

@@ -68,6 +68,11 @@ public class KeychainManager implements KeychainAccessProvider {
 		return keychain.getValue() != null;
 	}
 
+	@Override
+	public boolean isLocked() {
+		return keychain.getValue() == null || keychain.get().isLocked();
+	}
+
 	/**
 	 * Checks if the keychain knows a passphrase for the given key.
 	 * <p>

main/commons/src/main/java/org/cryptomator/common/settings/UiTheme.java

@@ -8,7 +8,7 @@ public enum UiTheme {
 	AUTOMATIC("preferences.general.theme.automatic");
 
 	public static UiTheme[] applicableValues() {
-		if (SystemUtils.IS_OS_MAC) {
+		if (SystemUtils.IS_OS_MAC || SystemUtils.IS_OS_WINDOWS) {
 			return values();
 		} else {
 			return new UiTheme[]{LIGHT, DARK};

main/commons/src/test/java/org/cryptomator/common/keychain/MapKeychainAccess.java

@@ -44,4 +44,9 @@ class MapKeychainAccess implements KeychainAccessProvider {
 		return true;
 	}
 
+	@Override
+	public boolean isLocked() {
+		return false;
+	}
+
 }