Merge #14879: qt: Add warning messages to the debug window

593ba69 Add warning messages to the debug window (Hennadii Stepanov)

Pull request description:

  Fix: #11016

  This PR adds warning messages to the debug window in `-disablewallet` mode.

  ![screenshot from 2018-12-06 01-01-27](https://user-images.githubusercontent.com/32963518/49550070-413c1c80-f8f3-11e8-9865-efb49ea8da45.png)

ACKs for top commit:
  jonasschnelli:
    utACK 593ba69
  promag:
    ACK 593ba69, agree with @Sjors bitcoin/bitcoin#14879 (review) above.
  ryanofsky:
    utACK 593ba69

Tree-SHA512: a8ca78529bb16813ba7bfaf5ccd4349189979f08e78ea857746a6fb00fd9d7ed98d8f06f384830acba21dac57070060af23f6be8249398feb32a6efff1333de8

Author: MarcoFalke

src/qt/forms/debugwindow.ui

@@ -14,6 +14,25 @@
    <string>Debug window</string>
   </property>
   <layout class="QVBoxLayout" name="verticalLayout_2">
+   <item>
+    <widget class="QLabel" name="label_alerts">
+     <property name="visible">
+      <bool>false</bool>
+     </property>
+     <property name="styleSheet">
+      <string notr="true">QLabel { background-color: qlineargradient(x1: 0, y1: 0, x2: 1, y2: 0, stop:0 #F0D0A0, stop:1 #F8D488); color:#000000; }</string>
+     </property>
+     <property name="wordWrap">
+      <bool>true</bool>
+     </property>
+     <property name="margin">
+      <number>3</number>
+     </property>
+     <property name="textInteractionFlags">
+      <set>Qt::TextSelectableByMouse</set>
+     </property>
+    </widget>
+   </item>
    <item>
     <widget class="QTabWidget" name="tabWidget">
      <property name="currentIndex">

src/qt/overviewpage.cpp

@@ -204,9 +204,8 @@ void OverviewPage::updateWatchOnlyLabels(bool showWatchOnly)
 void OverviewPage::setClientModel(ClientModel *model)
 {
     this->clientModel = model;
-    if(model)
-    {
-        // Show warning if this is a prerelease version
+    if (model) {
+        // Show warning, for example if this is a prerelease version
         connect(model, &ClientModel::alertsChanged, this, &OverviewPage::updateAlerts);
         updateAlerts(model->getStatusBarWarnings());
     }

src/qt/rpcconsole.cpp

@@ -558,6 +558,17 @@ bool RPCConsole::eventFilter(QObject* obj, QEvent *event)
 void RPCConsole::setClientModel(ClientModel *model)
 {
     clientModel = model;
+
+    bool wallet_enabled{false};
+#ifdef ENABLE_WALLET
+    wallet_enabled = WalletModel::isWalletEnabled();
+#endif // ENABLE_WALLET
+    if (model && !wallet_enabled) {
+        // Show warning, for example if this is a prerelease version
+        connect(model, &ClientModel::alertsChanged, this, &RPCConsole::updateAlerts);
+        updateAlerts(model->getStatusBarWarnings());
+    }
+
     ui->trafficGraph->setClientModel(model);
     if (model && clientModel->getPeerTableModel() && clientModel->getBanTableModel()) {
         // Keep up to date with client
@@ -1274,3 +1285,9 @@ QString RPCConsole::tabTitle(TabTypes tab_type) const
 {
     return ui->tabWidget->tabText(tab_type);
 }
+
+void RPCConsole::updateAlerts(const QString& warnings)
+{
+    this->ui->label_alerts->setVisible(!warnings.isEmpty());
+    this->ui->label_alerts->setText(warnings);
+}

src/qt/rpcconsole.h

@@ -167,6 +167,9 @@ public Q_SLOTS:
 
     /** Update UI with latest network info from model. */
     void updateNetworkState();
+
+private Q_SLOTS:
+    void updateAlerts(const QString& warnings);
 };
 
 #endif // BITCOIN_QT_RPCCONSOLE_H