Merge #17908: qt: Remove QFont warnings with QT_QPA_PLATFORM=minimal

1122817 qt: Remove QFont warnings with QPA=minimal (Hennadii Stepanov)

Pull request description:

  This PR removes massive warnings like:
  ```
  QWARN  : ... QFont::setPointSizeF: Point size <= 0 (...), must be greater than 0
  ```

  from `test_bitcoin-qt` output.

  On master (e258ce7):
  ```
  $ ./src/qt/test/test_bitcoin-qt | grep QFont | wc -l
  ~BitcoinApplication : Stopping thread
  ~BitcoinApplication : Stopped thread
  57
  ```

  With this PR:
  ```
  $ ./src/qt/test/test_bitcoin-qt | grep QFont | wc -l
  ~BitcoinApplication : Stopping thread
  ~BitcoinApplication : Stopped thread
  0
  ```

ACKs for top commit:
  promag:
    Code review ACK 1122817.
  jonasschnelli:
    utACK 1122817

Tree-SHA512: 32fa72a5d3db1d4c73a2a324aa9cad807ee46f23fc5319f7d71202987dc73ea7c90082904489b323a432e1afaebd9976b7dd0374236a16153162aa75fe368723

Author: jonasschnelli

src/qt/guiutil.cpp

@@ -48,13 +48,14 @@
 #include <QKeyEvent>
 #include <QLineEdit>
 #include <QList>
+#include <QMenu>
 #include <QMouseEvent>
 #include <QProgressDialog>
 #include <QScreen>
 #include <QSettings>
+#include <QShortcut>
 #include <QSize>
 #include <QString>
-#include <QShortcut>
 #include <QTextDocument> // for Qt::mightBeRichText
 #include <QThread>
 #include <QUrlQuery>
@@ -910,4 +911,11 @@ void LogQtInfo()
     }
 }
 
+void PopupMenu(QMenu* menu, const QPoint& point, QAction* at_action)
+{
+    // The qminimal plugin does not provide window system integration.
+    if (QApplication::platformName() == "minimal") return;
+    menu->popup(point, at_action);
+}
+
 } // namespace GUIUtil

src/qt/guiutil.h

@@ -28,9 +28,12 @@ namespace interfaces
 
 QT_BEGIN_NAMESPACE
 class QAbstractItemView;
+class QAction;
 class QDateTime;
 class QFont;
 class QLineEdit;
+class QMenu;
+class QPoint;
 class QProgressDialog;
 class QUrl;
 class QWidget;
@@ -273,6 +276,11 @@ namespace GUIUtil
      * Writes to debug.log short info about the used Qt and the host system.
      */
     void LogQtInfo();
+
+    /**
+     * Call QMenu::popup() only on supported QT_QPA_PLATFORM.
+     */
+    void PopupMenu(QMenu* menu, const QPoint& point, QAction* at_action = nullptr);
 } // namespace GUIUtil
 
 #endif // BITCOIN_QT_GUIUTIL_H

src/qt/rpcconsole.cpp

@@ -28,6 +28,7 @@
 #include <wallet/wallet.h>
 #endif
 
+#include <QFont>
 #include <QKeyEvent>
 #include <QMenu>
 #include <QMessageBox>
@@ -494,7 +495,7 @@ RPCConsole::RPCConsole(interfaces::Node& node, const PlatformStyle *_platformSty
     ui->detailWidget->hide();
     ui->peerHeading->setText(tr("Select a peer to view detailed information."));
 
-    consoleFontSize = settings.value(fontSizeSettingsKey, QFontInfo(QFont()).pointSize()).toInt();
+    consoleFontSize = settings.value(fontSizeSettingsKey, QFont().pointSize()).toInt();
     clear();
 
     GUIUtil::handleCloseWindowShortcut(this);

src/qt/transactionview.cpp

@@ -8,6 +8,7 @@
 #include <qt/bitcoinunits.h>
 #include <qt/csvmodelwriter.h>
 #include <qt/editaddressdialog.h>
+#include <qt/guiutil.h>
 #include <qt/optionsmodel.h>
 #include <qt/platformstyle.h>
 #include <qt/transactiondescdialog.h>
@@ -396,9 +397,8 @@ void TransactionView::contextualMenu(const QPoint &point)
     abandonAction->setEnabled(model->wallet().transactionCanBeAbandoned(hash));
     bumpFeeAction->setEnabled(model->wallet().transactionCanBeBumped(hash));
 
-    if(index.isValid())
-    {
-        contextMenu->popup(transactionView->viewport()->mapToGlobal(point));
+    if (index.isValid()) {
+        GUIUtil::PopupMenu(contextMenu, transactionView->viewport()->mapToGlobal(point));
     }
 }