[konheko] Fix some login page flow issues

* Fix page not transitioning back, if error happens to fast
* Fix error label not going away, when you fixed the login id
* Fix homeserver not updating, when you change your mxid

qml/pages/LoginPage.qml

@@ -65,9 +65,8 @@ Page {
             TextArea {
                 id: user_parse_error
 
-                visible: false
+                visible: text
                 color: "red"
-                font.pixelSize: 0
                 wrapMode: Text.WrapAtWordBoundaryOrAnywhere
                 readOnly: true
 
@@ -80,7 +79,6 @@ Page {
                     target: login
                     onUserParseError: {
                         user_parse_error.text = error;
-                        user_parse_error.visible = true;
                     }
                 }
 
@@ -88,7 +86,6 @@ Page {
                     target: login
                     onHomeserverInvalid: {
                         user_parse_error.text = error;
-                        user_parse_error.visible = true;
                         column.validateLogin();
                     }
                 }
@@ -97,7 +94,7 @@ Page {
                     target: login
                     onLoginError: {
                         user_parse_error.text = error;
-                        user_parse_error.visible = true;
+                        pageStack.completeAnimation();
                         pageStack.navigateBack();
                         column.validateLogin();
                     }
@@ -108,12 +105,11 @@ Page {
             TextField {
                 id: mxid
 
-                //: TextField hint for entering matrix id
-                label: qsTr("@matrix-id:your.homeserver")
-                placeholderText: label
-                EnterKey.enabled: text || inputMethodComposing
-                EnterKey.iconSource: "image://theme/icon-m-enter-next"
-                EnterKey.onClicked: {
+                function validateInput() {
+                    if (activeFocus)
+                        return ;
+
+                    user_parse_error.text = "";
                     if (homeserver.text.length == 0)
                         homeserver.visible = false;
 
@@ -121,6 +117,14 @@ Page {
                     password.focus = true;
                     column.validateLogin();
                 }
+
+                //: TextField hint for entering matrix id
+                label: qsTr("@matrix-id:your.homeserver")
+                placeholderText: label
+                EnterKey.enabled: text || inputMethodComposing
+                EnterKey.iconSource: "image://theme/icon-m-enter-next"
+                onActiveFocusChanged: validateInput()
+                EnterKey.onClicked: validateInput()
                 inputMethodHints: Qt.ImhNoPredictiveText
 
                 anchors {
@@ -184,6 +188,9 @@ Page {
                         homeserver.text = server;
                         homeserver.visible = true;
                     }
+                    onHomeserverValid: {
+                        homeserver.text = server;
+                    }
                 }
 
                 validator: RegExpValidator {

src/login.cpp

@@ -100,6 +100,8 @@ void Login::validateServer(QString server) {
                                               "the homeserver domain is valid."));
             return;
         }
+
+        emit homeserverValid(server);
     });
 }
 
@@ -132,7 +134,7 @@ void Login::login(QString mxid, QString password, QString server) {
     http::client().login(user.localpart(), password.toStdString(), "Konheko",
                          [this, homeserver](const mtx::responses::Login &response, mtx::http::RequestErr error) {
                              if (error) {
-                                 qDebug() << "Failed login!\n";
+                                 qDebug() << "Failed login!: " << *error;
                                  if (!error->matrix_error.error.empty()) {
                                      emit loginError(QString::fromStdString(error->matrix_error.error));
                                      return;

src/login.h

@@ -11,6 +11,7 @@ class Login : public QObject {
   signals:
     void userParseError(QString error);
     void homeserverInvalid(QString server, QString error);
+    void homeserverValid(QString server);
     void loginError(QString error);
     void loginSuccess();
     void loggedOut();