Reset track height to sane value on reset default values in settings dialog

src/dialogs/kdenlivesettingsdialog.cpp

@@ -70,7 +70,6 @@ KdenliveSettingsDialog::KdenliveSettingsDialog(QMap<QString, QString> mappable_a
 {
     KdenliveSettings::setV4l_format(0);
     QWidget *p1 = new QWidget;
-    QFontInfo ftInfo(font());
     m_configMisc.setupUi(p1);
     m_page1 = addPage(p1, i18n("Misc"));
     m_page1->setIcon(QIcon::fromTheme(QStringLiteral("configure")));
@@ -116,7 +115,6 @@ KdenliveSettingsDialog::KdenliveSettingsDialog(QMap<QString, QString> mappable_a
     m_configTimeline.setupUi(p3);
     m_page3 = addPage(p3, i18n("Timeline"));
     m_page3->setIcon(QIcon::fromTheme(QStringLiteral("video-display")));
-    m_configTimeline.kcfg_trackheight->setMinimum(ftInfo.pixelSize() * 1.5);
 
     QWidget *p2 = new QWidget;
     m_configEnv.setupUi(p2);
@@ -865,6 +863,21 @@ void KdenliveSettingsDialog::updateSettings()
         m_configEnv.ffprobeurl->setText(KdenliveSettings::ffprobepath());
     }
     
+    if (m_configTimeline.kcfg_trackheight->value() == 0) {
+        QFont ft = QFontDatabase::systemFont(QFontDatabase::SmallestReadableFont);
+        // Default unit for timeline.qml objects size
+        int baseUnit = qMax(28, (int) (QFontInfo(ft).pixelSize() * 1.8 + 0.5));
+        int trackHeight = qMax(50, (int) (2.2 * baseUnit + 6));
+        m_configTimeline.kcfg_trackheight->setValue(trackHeight);
+    } else {
+        QFont ft = QFontDatabase::systemFont(QFontDatabase::SmallestReadableFont);
+        // Default unit for timeline.qml objects size
+        int baseUnit = qMax(28, (int) (QFontInfo(ft).pixelSize() * 1.8 + 0.5));
+        if (m_configTimeline.kcfg_trackheight->value() < baseUnit) {
+            m_configTimeline.kcfg_trackheight->setValue(baseUnit);
+        }
+    }
+    
     bool resetConsumer = false;
     bool fullReset = false;
     bool updateCapturePath = false;

src/ui/configtimeline_ui.ui

@@ -87,7 +87,7 @@
      <item>
       <widget class="QSpinBox" name="kcfg_trackheight">
        <property name="minimum">
-        <number>10</number>
+        <number>0</number>
        </property>
        <property name="maximum">
         <number>999</number>