freecad: work around https://github.com/FreeCAD/FreeCAD/issues/10514 (#346740)

diff --git a/src/Gui/PreferencePages/DlgSettingsEditor.cpp b/src/Gui/PreferencePages/DlgSettingsEditor.cpp

index 5f92058c18..b00104497b 100644

--- a/src/Gui/PreferencePages/DlgSettingsEditor.cpp

+++ b/src/Gui/PreferencePages/DlgSettingsEditor.cpp

@@ -56,27 +56,34 @@ namespace

  *

  * Based on

  * https://stackoverflow.com/questions/18896933/qt-qfont-selection-of-a-monospace-font-doesnt-work

+ * Local fix to based on comment in

+ * https://github.com/FreeCAD/FreeCAD/issues/10514#issuecomment-1849176386

  */

+bool hasFixedPitch(const QFont& font)

+{

+    return QFontInfo(font).fixedPitch();

+}

+

 QFont getMonospaceFont()

 {

-    QFont font(QString::fromLatin1("monospace"));

-    if (font.fixedPitch()) {

-        return font;

-    }

-    font.setStyleHint(QFont::Monospace);

-    if (font.fixedPitch()) {

-        return font;

+    if (QFont font = QFontDatabase::systemFont(QFontDatabase::FixedFont); hasFixedPitch(font)) {

+        return font;  // should typically work.

     }

-    font.setStyleHint(QFont::TypeWriter);

-    if (font.fixedPitch()) {

+

+    QFont font;                         // default QApplication font

+    font.setStyleHint(QFont::Courier);  // may not work

+    if (hasFixedPitch(font)) {

         return font;

     }

-    font.setFamily(QString::fromLatin1("courier"));

-    if (font.fixedPitch()) {

-        return font;

+    for (const char* family : {"Monospace", "Courier"}) {

+        font.setFamily(QString::fromLatin1(family));

+        if (hasFixedPitch(font)) {

+            return font;

+        }

     }

-    return font;  // We failed, but return whatever we have anyway

+    return font;

 }

+

 }  // namespace

 /* TRANSLATOR Gui::Dialog::DlgSettingsEditor */

@@ -302,7 +309,7 @@ void DlgSettingsEditor::loadSettings()

     ui->fontSize->setValue(10);

     ui->fontSize->setValue(hGrp->GetInt("FontSize", ui->fontSize->value()));

-    QByteArray defaultMonospaceFont = getMonospaceFont().family().toLatin1();

+    QByteArray defaultMonospaceFont = QFontInfo(getMonospaceFont()).family().toLatin1();

 #if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)

     QStringList familyNames = QFontDatabase().families(QFontDatabase::Any);

  patches = [

    ./0001-NIXOS-don-t-ignore-PYTHONPATH.patch

    ./0002-FreeCad-OndselSolver-pkgconfig.patch

    ./0003-freecad-font-issue-10514.patch

  ];

  cmakeFlags = [