backport: merge bitcoin-core/gui#600, #601, #602, #701, #603 (migrate some QSettings to settings.json)

doc/release-notes-6833.md

@@ -0,0 +1,15 @@
+GUI changes
+-----------
+
+Configuration changes made in the Dash GUI (such as the pruning setting,
+proxy settings, UPNP preferences) are now saved to `<datadir>/settings.json`
+file rather than to the Qt settings backend (windows registry or unix desktop
+config files), so these settings will now apply to dashd, instead of being
+ignored.
+
+Also, the interaction between GUI settings and `dash.conf` settings is
+simplified. Settings from `dash.conf` are now displayed normally in the GUI
+settings dialog, instead of in a separate warning message ("Options set in this
+dialog are overridden by the configuration file: -setting=value"). And these
+settings can now be edited because `settings.json` values take precedence over
+`dash.conf` values.

src/qt/bitcoin.cpp

@@ -265,9 +265,26 @@ void BitcoinApplication::createPaymentServer()
 }
 #endif
 
-void BitcoinApplication::createOptionsModel(bool resetSettings)
+bool BitcoinApplication::createOptionsModel(bool resetSettings)
 {
-    optionsModel = new OptionsModel(this, resetSettings);
+    optionsModel = new OptionsModel(node(), this);
+    if (resetSettings) {
+        optionsModel->Reset();
+    }
+    bilingual_str error;
+    if (!optionsModel->Init(error)) {
+        fs::path settings_path;
+        if (gArgs.GetSettingsPath(&settings_path)) {
+            error += Untranslated("\n");
+            std::string quoted_path = strprintf("%s", fs::quoted(fs::PathToString(settings_path)));
+            error.original += strprintf("Settings file %s might be corrupt or invalid.", quoted_path);
+            error.translated += tr("Settings file %1 might be corrupt or invalid.").arg(QString::fromStdString(quoted_path)).toStdString();
+        }
+        InitError(error);
+        QMessageBox::critical(nullptr, PACKAGE_NAME, QString::fromStdString(error.translated));
+        return false;
+    }
+    return true;
 }
 
 void BitcoinApplication::createWindow(const NetworkStyle *networkStyle)
@@ -293,7 +310,6 @@ void BitcoinApplication::createNode(interfaces::Init& init)
 {
     assert(!m_node);
     m_node = init.makeNode();
-    if (optionsModel) optionsModel->setNode(*m_node);
     if (m_splash) m_splash->setNode(*m_node);
 }
 
@@ -330,7 +346,7 @@ void BitcoinApplication::parameterSetup()
 
 void BitcoinApplication::InitPruneSetting(int64_t prune_MiB)
 {
-    optionsModel->SetPruneTargetGB(PruneMiBtoGB(prune_MiB), true);
+    optionsModel->SetPruneTargetGB(PruneMiBtoGB(prune_MiB));
 }
 
 void BitcoinApplication::requestInitialize()
@@ -668,8 +684,17 @@ int GuiMain(int argc, char* argv[])
         QMessageBox::critical(nullptr, PACKAGE_NAME, QObject::tr("Error: Failed to load application fonts."));
         return EXIT_FAILURE;
     }
+
+    if (gArgs.GetBoolArg("-splash", DEFAULT_SPLASHSCREEN) && !gArgs.GetBoolArg("-min", false))
+        app.createSplashScreen(networkStyle.data());
+
+    app.createNode(*init);
+
     // Load GUI settings from QSettings
-    app.createOptionsModel(gArgs.GetBoolArg("-resetguisettings", false));
+    if (!app.createOptionsModel(gArgs.GetBoolArg("-resetguisettings", false))) {
+        return EXIT_FAILURE;
+    }
+
     // Validate/set font family
     if (gArgs.IsArgSet("-font-family")) {
         QString family = gArgs.GetArg("-font-family", GUIUtil::FontRegistry::DEFAULT_FONT.toUtf8().toStdString()).c_str();
@@ -758,11 +783,6 @@ int GuiMain(int argc, char* argv[])
         app.InitPruneSetting(prune_MiB);
     }
 
-    if (gArgs.GetBoolArg("-splash", DEFAULT_SPLASHSCREEN) && !gArgs.GetBoolArg("-min", false))
-        app.createSplashScreen(networkStyle.data());
-
-    app.createNode(*init);
-
     int rv = EXIT_SUCCESS;
     try
     {

src/qt/bitcoin.h

@@ -46,7 +46,7 @@ class BitcoinApplication: public QApplication
     /// parameter interaction/setup based on rules
     void parameterSetup();
     /// Create options model
-    void createOptionsModel(bool resetSettings);
+    [[nodiscard]] bool createOptionsModel(bool resetSettings);
     /// Initialize prune setting
     void InitPruneSetting(int64_t prune_MiB);
     /// Create main window

src/qt/forms/optionsdialog.ui

@@ -1140,7 +1140,7 @@ https://explore.transifex.com/dash/dash/</string>
         <item>
          <widget class="QLabel" name="overriddenByCommandLineInfoLabel">
           <property name="text">
-           <string>Options set in this dialog are overridden by the command line or in the configuration file:</string>
+           <string>Options set in this dialog are overridden by the command line:</string>
           </property>
           <property name="textFormat">
            <enum>Qt::PlainText</enum>

src/qt/optionsdialog.cpp

@@ -35,7 +35,6 @@
 #include <QIntValidator>
 #include <QLocale>
 #include <QMessageBox>
-#include <QSettings>
 #include <QShowEvent>
 #include <QSystemTrayIcon>
 #include <QTimer>
@@ -84,10 +83,6 @@ OptionsDialog::OptionsDialog(QWidget *parent, bool enableWallet) :
 #ifndef USE_NATPMP
     ui->mapPortNatpmp->setEnabled(false);
 #endif
-    connect(this, &QDialog::accepted, [this](){
-        QSettings settings;
-        model->node().mapPort(settings.value("fUseUPnP").toBool(), settings.value("fUseNatpmp").toBool());
-    });
 
     ui->proxyIp->setEnabled(false);
     ui->proxyPort->setEnabled(false);