recheck vault state when focusing window

fixes #1190
fixes #1110
fixes #1139

main/commons/src/main/java/org/cryptomator/common/vaults/VaultListManager.java

@@ -92,8 +92,27 @@ public class VaultListManager {
 		}
 		return compBuilder.build().vault();
 	}
+	
+	public static VaultState redetermineVaultState(Vault vault) {
+		VaultState previousState = vault.getState();
+		return switch (previousState) {
+			case LOCKED, NEEDS_MIGRATION, MISSING -> {
+				try {
+					VaultState determinedState = determineVaultState(vault.getPath());
+					vault.setState(determinedState);
+					yield determinedState;
+				} catch (IOException e) {
+					LOG.warn("Failed to determine vault state for " + vault.getPath(), e);
+					vault.setState(VaultState.ERROR);
+					vault.setLastKnownException(e);
+					yield VaultState.ERROR;
+				}
+			}
+			case ERROR, UNLOCKED, PROCESSING -> previousState;
+		};
+	}
 
-	public static VaultState determineVaultState(Path pathToVault) throws IOException {
+	private static VaultState determineVaultState(Path pathToVault) throws IOException {
 		if (!CryptoFileSystemProvider.containsVault(pathToVault, MASTERKEY_FILENAME)) {
 			return VaultState.MISSING;
 		} else if (Migrators.get().needsMigration(pathToVault, MASTERKEY_FILENAME)) {

main/ui/src/main/java/org/cryptomator/ui/mainwindow/MainWindowController.java

@@ -1,12 +1,17 @@
 package org.cryptomator.ui.mainwindow;
 
+import javafx.beans.Observable;
 import javafx.beans.property.BooleanProperty;
+import javafx.beans.property.ObjectProperty;
+import javafx.beans.property.ReadOnlyObjectProperty;
 import javafx.beans.property.SimpleBooleanProperty;
 import javafx.fxml.FXML;
 import javafx.scene.input.DragEvent;
 import javafx.scene.input.TransferMode;
 import javafx.scene.layout.StackPane;
+import javafx.stage.Stage;
 import org.apache.commons.lang3.SystemUtils;
+import org.cryptomator.common.vaults.Vault;
 import org.cryptomator.common.vaults.VaultListManager;
 import org.cryptomator.ui.common.FxController;
 import org.cryptomator.ui.wrongfilealert.WrongFileAlertComponent;
@@ -28,15 +33,19 @@ public class MainWindowController implements FxController {
 
 	private static final Logger LOG = LoggerFactory.getLogger(MainWindowController.class);
 
+	private final Stage window;
 	private final VaultListManager vaultListManager;
+	private final ReadOnlyObjectProperty<Vault> selectedVault;
 	private final WrongFileAlertComponent.Builder wrongFileAlert;
 	private final BooleanProperty draggingOver = new SimpleBooleanProperty();
 	private final BooleanProperty draggingVaultOver = new SimpleBooleanProperty();
 	public StackPane root;
 
 	@Inject
-	public MainWindowController(VaultListManager vaultListManager, WrongFileAlertComponent.Builder wrongFileAlert) {
+	public MainWindowController(@MainWindow Stage window, VaultListManager vaultListManager, ObjectProperty<Vault> selectedVault, WrongFileAlertComponent.Builder wrongFileAlert) {
+		this.window = window;
 		this.vaultListManager = vaultListManager;
+		this.selectedVault = selectedVault;
 		this.wrongFileAlert = wrongFileAlert;
 	}
 
@@ -50,6 +59,14 @@ public class MainWindowController implements FxController {
 		if (SystemUtils.IS_OS_WINDOWS) {
 			root.getStyleClass().add("os-windows");
 		}
+		window.focusedProperty().addListener(this::mainWindowFocusChanged);
+	}
+
+	private void mainWindowFocusChanged(Observable observable) {
+		var v = selectedVault.get();
+		if (v != null) {
+			VaultListManager.redetermineVaultState(v);
+		}
 	}
 
 	private void handleDragEvent(DragEvent event) {

main/ui/src/main/java/org/cryptomator/ui/mainwindow/VaultListController.java

@@ -64,20 +64,7 @@ public class VaultListController implements FxController {
 		if (newValue == null) {
 			return;
 		}
-		VaultState reportedState = newValue.getState();
-		switch (reportedState) {
-			case LOCKED, NEEDS_MIGRATION, MISSING -> {
-				try {
-					VaultState determinedState = VaultListManager.determineVaultState(newValue.getPath());
-					newValue.setState(determinedState);
-				} catch (IOException e) {
-					LOG.warn("Failed to determine vault state for " + newValue.getPath(), e);
-					newValue.setState(VaultState.ERROR);
-					newValue.setLastKnownException(e);
-				}
-			}
-			case ERROR, UNLOCKED, PROCESSING -> {}
-		}
+		VaultListManager.redetermineVaultState(newValue);
 	}
 
 	@FXML