update migration dialogue

main/ui/src/main/java/org/cryptomator/ui/migration/MigrationImpossibleController.java

@@ -10,6 +10,8 @@ import javax.inject.Inject;
 
 public class MigrationImpossibleController implements FxController {
 
+	private static final String HELP_URI = "https://community.cryptomator.org/TODO";
+
 	private final FxApplication fxApplication;
 	private final Stage window;
 	private final Vault vault;
@@ -26,10 +28,19 @@ public class MigrationImpossibleController implements FxController {
 		window.close();
 	}
 
+	@FXML
+	public void getMigrationHelp() {
+		fxApplication.getHostServices().showDocument(HELP_URI);
+	}
+
 	/* Getter/Setters */
 
 	public Vault getVault() {
 		return vault;
 	}
 
+	public String getHelpUri() {
+		return HELP_URI;
+	}
+
 }

main/ui/src/main/resources/fxml/migration_impossible.fxml

@@ -1,29 +1,41 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
 
+<?import javafx.geometry.Insets?>
 <?import javafx.scene.control.Button?>
 <?import javafx.scene.control.ButtonBar?>
 <?import javafx.scene.control.Label?>
-<?import javafx.scene.layout.AnchorPane?>
 <?import javafx.scene.layout.HBox?>
 <?import javafx.scene.layout.StackPane?>
 <?import javafx.scene.layout.VBox?>
 <?import javafx.scene.shape.Circle?>
+<?import javafx.scene.text.Text?>
+<?import javafx.scene.text.TextFlow?>
 <?import org.cryptomator.ui.controls.FontAwesome5IconView?>
 
-<AnchorPane xmlns="http://javafx.com/javafx"
-			xmlns:fx="http://javafx.com/fxml"
-			fx:controller="org.cryptomator.ui.migration.MigrationImpossibleController"
-			prefHeight="400.0" prefWidth="600.0">
+<?import javafx.scene.control.Hyperlink?>
+<VBox xmlns="http://javafx.com/javafx"
+	  xmlns:fx="http://javafx.com/fxml"
+	  fx:controller="org.cryptomator.ui.migration.MigrationImpossibleController"
+	  minWidth="400"
+	  maxWidth="400"
+	  minHeight="145"
+	  spacing="12">
+	<padding>
+		<Insets topRightBottomLeft="12"/>
+	</padding>
 
 	<HBox spacing="12" alignment="CENTER_LEFT" VBox.vgrow="ALWAYS">
 		<StackPane alignment="CENTER" HBox.hgrow="NEVER">
 			<Circle styleClass="glyph-icon-primary" radius="24"/>
 			<FontAwesome5IconView styleClass="glyph-icon-white" glyph="TIMES" glyphSize="24"/>
 		</StackPane>
-		<Label text="%migration.impossible.nextStepsInstructions" wrapText="true" HBox.hgrow="ALWAYS"/>
-
-		<!-- TODO: maybe add error why it is not possible -->
+		<TextFlow>
+			<Label text="%migration.impossible.reason" wrapText="true" HBox.hgrow="ALWAYS"/>
+			<Text text="%migration.impossible.nextStepsInstructions" wrappingWidth="382" HBox.hgrow="ALWAYS"/>
+			<Text  text="%migration.impossible.moreInfo"/>
+			<Hyperlink text="${controller.helpUri}" onAction="#getMigrationHelp"/>
+		</TextFlow>
 	</HBox>
 
 	<VBox alignment="BOTTOM_CENTER" VBox.vgrow="ALWAYS">
@@ -34,4 +46,4 @@
 			</buttons>
 		</ButtonBar>
 	</VBox>
-</AnchorPane>
+</VBox>

main/ui/src/main/resources/i18n/strings.properties

@@ -119,7 +119,9 @@ migration.error.missingFileSystemCapabilities.reason.LONG_PATHS=The file system
 migration.error.missingFileSystemCapabilities.reason.READ_ACCESS=The file system does not allow to be read.
 migration.error.missingFileSystemCapabilities.reason.WRITE_ACCESS=The file system does not allow to be written to.
 ## Impossible
-migration.impossible.nextStepsInstructions=Cryptomator cannot migrate the vault automatically due to TODO. You need to migrate manually. FOr more information, please read TODO.
+migration.impossible.reason=Cryptomator cannot automatically migrate this vault because the storage location or its access point are not fully-compatible with the newer vault version.
+migration.impossible.nextStepsInstructions=To use this vault with the current version, you either need to move the vault to a different, fully supported location or need to manually create a new vault and copy all files to it.
+migration.impossible.moreInfo=For more information, please visit:
 
 # Preferences
 preferences.title=Preferences