Allow password field to be cleared with Ctrl/Command + backspace, implements #885.

main/ui/src/main/java/org/cryptomator/ui/controls/SecurePasswordField.java

@@ -22,6 +22,8 @@ import javafx.scene.control.TextField;
 import javafx.scene.input.DragEvent;
 import javafx.scene.input.Dragboard;
 import javafx.scene.input.KeyCode;
+import javafx.scene.input.KeyCodeCombination;
+import javafx.scene.input.KeyCombination;
 import javafx.scene.input.KeyEvent;
 import javafx.scene.input.TransferMode;
 
@@ -43,6 +45,7 @@ public class SecurePasswordField extends TextField {
 	private static final int GROW_BUFFER_SIZE = 50;
 	private static final String DEFAULT_PLACEHOLDER = "●";
 	private static final String STYLE_CLASS = "secure-password-field";
+    private static final KeyCodeCombination SHORTCUT_BACKSPACE = new KeyCodeCombination(KeyCode.BACK_SPACE, KeyCombination.SHORTCUT_DOWN);
 
 	private final String placeholderChar;
 	private final BooleanProperty capsLocked = new SimpleBooleanProperty();
@@ -100,6 +103,9 @@ public class SecurePasswordField extends TextField {
 		if (e.getCode() == KeyCode.CAPS) {
 			updateCapsLocked();
 		}
+        if (SHORTCUT_BACKSPACE.match(e)) {
+            swipe();
+        }
 	}
 
 	private void revealPasswordChanged(@SuppressWarnings("unused") Observable observable) {