Add automatic login feature

I am using .pg_service.conf to define all connection parameters, and
.pgpass for the password, thus i never have to input anything to the
login form, and want to skip it.

However, just in case someday i need to set the connection up
differently, i only try to log in automatically on startup, and can go
back to the login page by logging out, as usual.

src/LoginPage.qml

@@ -8,6 +8,7 @@ Page {
     id: page
 
     function saveSettings() {
+        settings.autoLogIn = autoLogIn.checked;
         settings.connectOptions = connectOptions.text;
         settings.databaseName = databaseName.text;
         settings.hostName = hostName.text;
@@ -15,6 +16,12 @@ Page {
         settings.usePort = usePort.checked;
     }
 
+    function tryAutoLogIn() {
+        if (autoLogIn.checked) {
+            loginAction.trigger();
+        }
+    }
+
     title: qsTr("Login")
 
     ColumnLayout {
@@ -133,6 +140,22 @@ Page {
 
                     onAccepted: loginAction.trigger()
                 }
+
+                CheckBox {
+                    id: autoLogIn
+
+                    Layout.alignment: Qt.AlignRight
+                    Layout.columnSpan: 2
+                    Mnemonic.label: qsTr("Log in auto&matically")
+                    checked: settings.autoLogIn
+                    text: Mnemonic.richTextLabel
+
+                    Shortcut {
+                        sequence: autoLogIn.Mnemonic.sequence
+
+                        onActivated: autoLogIn.click()
+                    }
+                }
             }
         }
 
@@ -145,6 +168,7 @@ Page {
     Settings {
         id: settings
 
+        property bool autoLogIn: false
         property string connectOptions: ""
         property string databaseName: ""
         property string hostName: ""

src/Main.qml

@@ -9,6 +9,10 @@ ApplicationWindow {
     visible: true
     width: 640
 
+    Component.onCompleted: function () {
+        (pageStack.currentItem as LoginPage)?.tryAutoLogIn();
+    }
+
     StackView {
         id: pageStack