qml: Clear saved password using onPressed handler

Using onTextEdited meant that the clear() call would happen after the edit had actually happened.

Instead, use the Keys.onPressed handler, which happens earlier in the input chain.

src/OptionsPopup.qml

@@ -153,19 +153,26 @@ Window {
                                     }
                                     TextField {
                                         id: fieldUserPassword
-                                        echoMode: TextInput.Password
+                                        echoMode: TextInput.PasswordEchoOnEdit
                                         Layout.minimumWidth: 200
                                         selectByMouse: true
                                         property bool alreadyCrypted: false
                                         property bool indicateError: false
 
-                                        onTextEdited: {
+                                        Keys.onPressed: (event)=> {
                                             if (alreadyCrypted) {
                                                 /* User is trying to edit saved
                                                    (crypted) password, clear field */
                                                 alreadyCrypted = false
                                                 clear()
                                             }
+
+                                            // Do not mark the event as accepted, so that it may
+                                            // propagate down to the underlying TextField.
+                                            event.accepted = false
+                                        }
+
+                                        onTextEdited: {
                                             if (indicateError) {
                                                 indicateError = false
                                             }