diff --git a/LICENSE b/LICENSE
index 7d45b10..1434e3a 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2016-2020 Advanced Micro Devices, Inc. All Rights Reserved.
+Copyright (c) 2016-2021 Advanced Micro Devices, Inc. All Rights Reserved.
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/custom_widgets/arrow_icon_combo_box.cpp b/custom_widgets/arrow_icon_combo_box.cpp
index e3aa580..b1fa752 100644
--- a/custom_widgets/arrow_icon_combo_box.cpp
+++ b/custom_widgets/arrow_icon_combo_box.cpp
@@ -635,15 +635,16 @@ bool ArrowIconComboBox::eventFilter(QObject* object, QEvent* event)
 {
     Q_UNUSED(object);
 
-    Q_ASSERT(item_list_ != nullptr);
-
-    if (event != nullptr && item_list_ != nullptr)
+    if (event != nullptr)
     {
         if (event->type() == QEvent::MouseButtonPress)
         {
-            if ((this->underMouse() == false) && (item_list_->underMouse() == false))
+            if (item_list_ != nullptr)
             {
-                CloseMenu();
+                if ((this->underMouse() == false) && (item_list_->underMouse() == false))
+                {
+                    CloseMenu();
+                }
             }
         }
     }
@@ -793,7 +794,7 @@ void ArrowIconComboBox::paintEvent(QPaintEvent* event)
     painter.save();
 
     // Paint background
-    painter.fillRect(rect(), palette().background());
+    painter.fillRect(rect(), palette().window());
 
     // Set properties for the lines
     QPen pen;
diff --git a/custom_widgets/check_box_widget.cpp b/custom_widgets/check_box_widget.cpp
index 1821fce..da8aaa2 100644
--- a/custom_widgets/check_box_widget.cpp
+++ b/custom_widgets/check_box_widget.cpp
@@ -92,8 +92,11 @@ QSize CheckBoxWidget::sizeHint() const
 
     // Calculate max length of the on and off text strings,
     // using TextShowMnemonic so that keyboard shortcuts indicated by '&' are taken into account.
-    int on_text_width  = fontMetrics().width(on_text_, -1, Qt::TextShowMnemonic);
-    int off_text_width = fontMetrics().width(off_text_, -1, Qt::TextShowMnemonic);
+    const QRect& on_rect  = fontMetrics().boundingRect(on_text_);
+    const QRect& off_rect = fontMetrics().boundingRect(off_text_);
+
+    int on_text_width  = fontMetrics().boundingRect(on_rect, Qt::TextShowMnemonic, on_text_).width();
+    int off_text_width = fontMetrics().boundingRect(off_rect, Qt::TextShowMnemonic, off_text_).width();
     int max_text_width = std::max(on_text_width, off_text_width);
 
     QSize size;
diff --git a/custom_widgets/colored_legend_scene.cpp b/custom_widgets/colored_legend_scene.cpp
index 6400a9f..b0ced2b 100644
--- a/custom_widgets/colored_legend_scene.cpp
+++ b/custom_widgets/colored_legend_scene.cpp
@@ -133,9 +133,9 @@ void ColoredLegendScene::Update()
             item.rect_item_->setRect(0, 0, scaled_base_height, scaled_base_height);
             item.text_item_->setPos(x_pos + scaled_base_height, y_pos_top - kVerticalSpacingAroundText);
             item.text_item_->setFont(text_font);
-            int textWidth = font_metrics.width(item.text_item_->toPlainText());
+            const int text_width = font_metrics.boundingRect(item.text_item_->toPlainText()).width();
 
-            x_pos += scaled_base_height + textWidth + kHorizontalSpacingAfterText;
+            x_pos += scaled_base_height + text_width + kHorizontalSpacingAfterText;
         }
     }
     else if (legend_mode_ == LegendMode::kText)
@@ -144,7 +144,7 @@ void ColoredLegendScene::Update()
         {
             text_legends_[i]->setPos(x_pos, y_pos_top);
             text_legends_[i]->setFont(text_font);
-            int text_width = font_metrics.width(text_legends_[i]->toPlainText());
+            const int text_width = font_metrics.boundingRect(text_legends_[i]->toPlainText()).width();
 
             x_pos += text_width + ScalingManager::Get().Scaled(kHorizontalSpacingAfterText);
         }
diff --git a/custom_widgets/donut_pie_widget.cpp b/custom_widgets/donut_pie_widget.cpp
index 6977c43..1308a65 100644
--- a/custom_widgets/donut_pie_widget.cpp
+++ b/custom_widgets/donut_pie_widget.cpp
@@ -44,7 +44,7 @@ void DonutPieWidget::paintEvent(QPaintEvent* paint_event)
     QPainter painter(this);
 
     painter.setRenderHint(QPainter::Antialiasing);
-    painter.fillRect(rect(), palette().background());
+    painter.fillRect(rect(), palette().window());
 
     const int width  = rect().width();
     const int height = rect().height();
@@ -56,7 +56,7 @@ void DonutPieWidget::paintEvent(QPaintEvent* paint_event)
     const QFontMetrics& font_metrics = ScalingManager::Get().ScaledFontMetrics(font());
     for (unsigned int index = 0; index < num_segments_; ++index)
     {
-        const int text_width = font_metrics.width(slices_[index].slice_text_);
+        const int text_width = font_metrics.boundingRect(slices_[index].slice_text_).width();
 
         max_width = std::max(max_width, text_width);
     }
@@ -131,7 +131,7 @@ void DonutPieWidget::paintEvent(QPaintEvent* paint_event)
     }
 
     // draw the text labels on the arcs
-    painter.setPen(palette().foreground().color());
+    painter.setPen(palette().windowText().color());
     for (unsigned int loop = 0; loop < num_segments_; loop++)
     {
         const QPoint label_pos = label_positions.dequeue();
diff --git a/custom_widgets/double_slider_widget.cpp b/custom_widgets/double_slider_widget.cpp
index 446ce4e..7c0b2ed 100644
--- a/custom_widgets/double_slider_widget.cpp
+++ b/custom_widgets/double_slider_widget.cpp
@@ -159,17 +159,17 @@ void DoubleSliderWidget::SetupPainter(QPainter* painter, Qt::Orientation orienta
 {
     QColor          highlight = palette().color(QPalette::Highlight);
     QLinearGradient gradient(start_x, start_y, end_x, end_y);
-    gradient.setColorAt(0, highlight.dark(120));
-    gradient.setColorAt(1, highlight.light(108));
+    gradient.setColorAt(0, highlight.darker(120));
+    gradient.setColorAt(1, highlight.lighter(108));
     painter->setBrush(gradient);
 
     if (orientation == Qt::Horizontal)
     {
-        painter->setPen(QPen(highlight.dark(130), 0));
+        painter->setPen(QPen(highlight.darker(130), 0));
     }
     else
     {
-        painter->setPen(QPen(highlight.dark(150), 0));
+        painter->setPen(QPen(highlight.darker(150), 0));
     }
 }
 
@@ -193,7 +193,7 @@ void DoubleSliderWidget::DrawSpan(QStylePainter* painter, const QRect& span_area
     groove_rect.setHeight(1);
 
     // pen & brush
-    painter->setPen(QPen(double_slider->palette().color(QPalette::Dark).light(), 0));
+    painter->setPen(QPen(double_slider->palette().color(QPalette::Dark).lighter(), 0));
 
     if (option.orientation == Qt::Horizontal)
     {
diff --git a/custom_widgets/file_loading_widget.cpp b/custom_widgets/file_loading_widget.cpp
index bd56e14..a405e0b 100644
--- a/custom_widgets/file_loading_widget.cpp
+++ b/custom_widgets/file_loading_widget.cpp
@@ -243,11 +243,11 @@ void FileLoadingWidget::paintEvent(QPaintEvent* event)
     painter.setRenderHint(QPainter::Antialiasing);
 
     // Draw background of widget
-    painter.setBrush(palette().background());
+    painter.setBrush(palette().window());
     painter.setPen(Qt::NoPen);
     painter.drawRect(0, 0, width(), height());
 
-    painter.setBrush(palette().foreground());
+    painter.setBrush(palette().windowText());
     double x_offset = (contentsRect().width() / 2) - 1;
     painter.translate(contentsRect().center() - QPoint(x_offset, 0));
 
diff --git a/custom_widgets/icon_button.cpp b/custom_widgets/icon_button.cpp
index 94307e3..2dabb5a 100644
--- a/custom_widgets/icon_button.cpp
+++ b/custom_widgets/icon_button.cpp
@@ -84,7 +84,7 @@ void IconButton::paintEvent(QPaintEvent* event)
     Q_UNUSED(event);
 
     QStylePainter painter(this);
-    painter.setPen(QPen(palette().color(QPalette::Background)));
+    painter.setPen(QPen(palette().color(QPalette::Window)));
     painter.drawLine(rect().topLeft(), rect().topRight());
     if (!isEnabled())
     {
diff --git a/custom_widgets/list_widget.cpp b/custom_widgets/list_widget.cpp
index 813bf0a..e434c5c 100644
--- a/custom_widgets/list_widget.cpp
+++ b/custom_widgets/list_widget.cpp
@@ -40,13 +40,13 @@ ListWidget::ListWidget(QWidget* parent, ArrowIconComboBox* button, bool hide)
     , parent_(parent)
     , show_list_above_button_(false)
 {
-    connect(qApp, SIGNAL(focusChanged(QWidget*, QWidget*)), this, SLOT(FocusChanged(QWidget*, QWidget*)));
+    connect(qApp, &QApplication::focusChanged, this, &ListWidget::FocusChanged);
     connect(&ScalingManager::Get(), &ScalingManager::ScaleFactorChanged, this, &ListWidget::OnScaleFactorChanged);
 }
 
 ListWidget::~ListWidget()
 {
-    disconnect(qApp, SIGNAL(focusChanged(QWidget*, QWidget*)), this, SLOT(FocusChanged(QWidget*, QWidget*)));
+    disconnect(qApp, &QApplication::focusChanged, this, &ListWidget::FocusChanged);
     disconnect(&ScalingManager::Get(), &ScalingManager::ScaleFactorChanged, this, &ListWidget::OnScaleFactorChanged);
 }
 
diff --git a/custom_widgets/quick_link_button_widget.cpp b/custom_widgets/quick_link_button_widget.cpp
index cd7e79b..1998708 100644
--- a/custom_widgets/quick_link_button_widget.cpp
+++ b/custom_widgets/quick_link_button_widget.cpp
@@ -59,8 +59,8 @@ QSize QuickLinkButtonWidget::sizeHint() const
     QFontMetrics desc_font_metrics(tmp_font);
 
     // The width is defined by the width of the widest line of text, based on the font they will be drawn with.
-    int width = std::max(std::max(title_font_metrics.width(title_string_), desc_font_metrics.width(description_line_one_)),
-                         desc_font_metrics.width(description_line_two_));
+    int width = std::max(std::max(title_font_metrics.horizontalAdvance(title_string_), desc_font_metrics.horizontalAdvance(description_line_one_)),
+                         desc_font_metrics.boundingRect(description_line_two_).width());
     width += (contentsMargins().left() + contentsMargins().right());
 
     // The height is defined by the height of the title plus two lines of description plus two line spacing between the text.
diff --git a/custom_widgets/scaled_check_box.cpp b/custom_widgets/scaled_check_box.cpp
index 22ce946..700fdae 100644
--- a/custom_widgets/scaled_check_box.cpp
+++ b/custom_widgets/scaled_check_box.cpp
@@ -7,6 +7,7 @@
 #include "scaled_check_box.h"
 
 #include <QStyle>
+#include <QEvent>
 
 #include "utils/qt_util.h"
 #include "utils/scaling_manager.h"
@@ -40,7 +41,8 @@ QSize ScaledCheckBox::sizeHint() const
 
     // Calculate length of the text string,
     // using TextShowMnemonic so that keyboard shortcuts indicated by '&' are taken into account.
-    int text_width = fontMetrics().width(text(), -1, Qt::TextShowMnemonic);
+    const QRect& rect       = fontMetrics().boundingRect(text());
+    int          text_width = fontMetrics().boundingRect(rect, Qt::TextShowMnemonic, text()).width();
 
     QSize size;
     size.setWidth(icon_width + spacing + text_width);
@@ -52,7 +54,7 @@ QSize ScaledCheckBox::sizeHint() const
 void ScaledCheckBox::UpdateIndicatorSize()
 {
     // It appears the only way (or at least easiest way) to set the indicator size is through the stylesheet.
-    this->setStyleSheet(kIndicatorSizeStylesheet_.arg(fontMetrics().height()));
+    this->setStyleSheet(kIndicatorSizeStylesheet_.arg(fontMetrics().ascent()));
 }
 
 void ScaledCheckBox::OnScaleFactorChanged()
@@ -68,3 +70,22 @@ void ScaledCheckBox::OnScaleFactorChanged()
     updateGeometry();
     update();
 }
+
+void ScaledCheckBox::changeEvent(QEvent* event)
+{
+    QCheckBox::changeEvent(event);
+
+    if (!invalidating_font_metrics_)
+    {
+        if (event->type() == QEvent::FontChange)
+        {
+            invalidating_font_metrics_ = true;
+            QtCommon::QtUtils::InvalidateFontMetrics(this);
+            invalidating_font_metrics_ = false;
+
+            UpdateIndicatorSize();
+
+            updateGeometry();
+        }
+    }
+}
diff --git a/custom_widgets/scaled_check_box.h b/custom_widgets/scaled_check_box.h
index d66ddbf..86db10d 100644
--- a/custom_widgets/scaled_check_box.h
+++ b/custom_widgets/scaled_check_box.h
@@ -42,10 +42,19 @@ class ScaledCheckBox : public QCheckBox
     /// and assumes a 1:1 width:height ratio of the indicator icons.
     const QString kIndicatorSizeStylesheet_ = "ScaledCheckBox::indicator { width: %1px; height: %1px; }";
 
+protected:
+    /// \brief Reimplement changeEvent to handle resizing on fontChange.
+    /// \param event The event that caused the change.
+    virtual void changeEvent(QEvent* event) override;
+
 private slots:
     /// Handler for ScaleFactorChanged signals.
     /// Invalidates font sizes and resizes the checkbox indicator.
     void OnScaleFactorChanged();
+
+private:
+    /// Track if invalidating font metrics so the changeEvent does not become recursive.
+    bool invalidating_font_metrics_;
 };
 
-#endif  // QTCOMMON_CUSTOM_WIDGETS_SCALED_CHECKBOX_H_
\ No newline at end of file
+#endif  // QTCOMMON_CUSTOM_WIDGETS_SCALED_CHECKBOX_H_
diff --git a/custom_widgets/scaled_push_button.cpp b/custom_widgets/scaled_push_button.cpp
index f6e2d6f..412a097 100644
--- a/custom_widgets/scaled_push_button.cpp
+++ b/custom_widgets/scaled_push_button.cpp
@@ -1,8 +1,8 @@
 //=============================================================================
-/// Copyright (c) 2019-2020 Advanced Micro Devices, Inc. All rights reserved.
-/// \author AMD Developer Tools Team
-/// \file
-/// \brief Scaling wrapper for QPushButton objects.
+/// Copyright (c) 2019-2021 Advanced Micro Devices, Inc. All rights reserved.
+/// @author AMD Developer Tools Team
+/// @file
+/// @brief Scaling wrapper for QPushButton objects.
 //=============================================================================
 #include "scaled_push_button.h"
 
@@ -11,6 +11,7 @@
 
 ScaledPushButton::ScaledPushButton(QWidget* parent)
     : QPushButton(parent)
+    , base_icon_size_(QSize())
 {
     setSizePolicy(QSizePolicy::Policy::Fixed, QSizePolicy::Policy::Fixed);
 
@@ -30,10 +31,23 @@ ScaledPushButton::~ScaledPushButton()
     disconnect(&ScalingManager::Get(), &ScalingManager::ScaleFactorChanged, this, &ScaledPushButton::OnScaleFactorChanged);
 }
 
+void ScaledPushButton::setIconSize(const QSize& size)
+{
+    QPushButton::setIconSize(size);
+
+    base_icon_size_ = size;
+}
+
 void ScaledPushButton::OnScaleFactorChanged()
 {
     QtCommon::QtUtils::InvalidateFontMetrics(this);
 
+    if (!icon().isNull() && base_icon_size_.isValid())
+    {
+        ScalingManager& sm = ScalingManager::Get();
+        QPushButton::setIconSize(QSize(sm.Scaled(base_icon_size_.width()), sm.Scaled(base_icon_size_.height())));
+    }
+
     if (parentWidget() != nullptr && parentWidget()->layout() != nullptr)
     {
         // If there is a parent widget and the parent has a layout,
diff --git a/custom_widgets/scaled_push_button.h b/custom_widgets/scaled_push_button.h
index 6ec6425..b38d9d9 100644
--- a/custom_widgets/scaled_push_button.h
+++ b/custom_widgets/scaled_push_button.h
@@ -1,8 +1,8 @@
 //=============================================================================
-/// Copyright (c) 2019-2020 Advanced Micro Devices, Inc. All rights reserved.
-/// \author AMD Developer Tools Team
-/// \file
-/// \brief Scaling wrapper for QPushButton object.
+/// Copyright (c) 2019-2021 Advanced Micro Devices, Inc. All rights reserved.
+/// @author AMD Developer Tools Team
+/// @file
+/// @brief Scaling wrapper for QPushButton object.
 //=============================================================================
 
 #ifndef QTCOMMON_CUSTOM_WIDGETS_SCALED_PUSHBUTTON_H_
@@ -10,27 +10,37 @@
 
 #include <QPushButton>
 
-/// Wraps the QPushButton and fixes DPI scaling.
+/// @brief Wraps the QPushButton and fixes DPI scaling.
 class ScaledPushButton : public QPushButton
 {
     Q_OBJECT
 
 public:
-    /// Constructor.
-    /// \param parent The parent object.
+    /// @brief Constructor.
+    ///
+    /// @param parent The parent object.
     ScaledPushButton(QWidget* parent = nullptr);
 
-    /// Constructor.
-    /// \param text The button text.
-    /// \param parent The parent object.
+    /// @brief Constructor.
+    ///
+    /// @param text The button text.
+    /// @param parent The parent object.
     ScaledPushButton(const QString& text, QWidget* parent = nullptr);
 
-    /// Destructor.
+    /// @brief Destructor.
     virtual ~ScaledPushButton();
 
+    /// @brief Overridden setIconSize for the QAbstractButton.
+    ///
+    /// @param size Maximum size for the icon. Smaller icons will not be scaled up.
+    void setIconSize(const QSize& size);
+
 private slots:
-    /// Callback for when the DPI scale factor changes.
+    /// @brief Callback for when the DPI scale factor changes.
     void OnScaleFactorChanged();
+
+private:
+    QSize base_icon_size_;  ///< Base icon size DPI scaling will be calculated from.
 };
 
 #endif  // QTCOMMON_CUSTOM_WIDGETS_SCALED_PUSHBUTTON_H_
diff --git a/custom_widgets/tab_bar.cpp b/custom_widgets/tab_bar.cpp
index a399a91..7ea2e26 100644
--- a/custom_widgets/tab_bar.cpp
+++ b/custom_widgets/tab_bar.cpp
@@ -109,8 +109,8 @@ QSize TabBar::tabSizeHint(int index) const
             // a call to tabwidget->adjustSize() may be needed in a showEvent
             // to force the tabwidget to update the tab-bar
             //
-            int tab_widget_width = tab_widget->width();
-            int x                = QTabBar::tabRect(index).x();
+            int tab_widget_width = tab_widget->geometry().width();
+            int x                = this->mapFromGlobal(QPoint(QTabBar::tabRect(index).x(), 0)).x();
             int remaining        = qAbs(tab_widget_width - x);
 
             return QSize(remaining, height);
diff --git a/custom_widgets/text_search_widget.cpp b/custom_widgets/text_search_widget.cpp
index 0291c2e..ed62fba 100644
--- a/custom_widgets/text_search_widget.cpp
+++ b/custom_widgets/text_search_widget.cpp
@@ -26,7 +26,7 @@ TextSearchWidget::TextSearchWidget(QWidget* parent)
     setStyleSheet(kTextSearchStylesheet);
 
     // connect text changed signal/slot
-    connect(this, SIGNAL(textChanged(const QString&)), this, SLOT(HandleTextChanged(const QString&)));
+    connect(this, &TextSearchWidget::textChanged, this, &TextSearchWidget::HandleTextChanged);
 
     // Set place holder text to search boxes
     setPlaceholderText("Search...");
diff --git a/utils/qt_util.cpp b/utils/qt_util.cpp
index 0b81832..49e5f32 100644
--- a/utils/qt_util.cpp
+++ b/utils/qt_util.cpp
@@ -277,7 +277,7 @@ namespace QtCommon
 
     int QtUtils::GetTextWidth(const QFont& font, const QString& str)
     {
-        return ScalingManager::Get().ScaledFontMetrics(font).width(str);
+        return ScalingManager::Get().ScaledFontMetrics(font).boundingRect(str).width();
     }
 
     int QtUtils::GetPainterTextWidth(QPainter* pPainter, const QString& str)
diff --git a/utils/scaling_manager.h b/utils/scaling_manager.h
index 3e23756..0402af9 100644
--- a/utils/scaling_manager.h
+++ b/utils/scaling_manager.h
@@ -102,10 +102,10 @@ class ScalingManager : public QObject
     /// An example might be a custom painted widget that should be 50x50 pixels when at 100% DPI
     /// and needs to get scaled larger at higher DPI scaling values; ie: 50*150% = 75x75 pixels at 150% DPI.
     /// And when going back down to 100% DPI, the original values can be used: ie: 50* 100% = 50x50 pixels at 100%.
-    ///< An initial DPI Scale of 200% => m_scaleFactor = 2.0;
-    ///< Changing DPI Scale to 100% => m_scaleFactor = 1.0;
-    ///< Changing DPI Scale to 200% => m_scaleFactor = 2.0;
-    ///< Changing DPI Scale to 300% => m_scaleFactor = 3.0;
+    ///< An initial DPI Scale of 200% => scale_factor_ = 2.0;
+    ///< Changing DPI Scale to 100% => scale_factor_ = 1.0;
+    ///< Changing DPI Scale to 200% => scale_factor_ = 2.0;
+    ///< Changing DPI Scale to 300% => scale_factor_ = 3.0;
     double scale_factor_;
 
     /// UI rescale factor
@@ -116,19 +116,19 @@ class ScalingManager : public QObject
     /// which would change a 10pt font size into a 15pt font. Thus, calling font.pointSize() would now return 15 instead of 10.
     /// In order to reduce from 150% back down to 100% DPI scaling, the current value off font.pointSize() needs to get scaled back down.
     /// The same line of code can be used to rescale down from the current value: font.setPointSize(font.pointSize() * rescale_factor_).
-    ///< An initial DPI scale of 200% => m_rescaleFactor = 1.0. (ie: there is no previous scale, so nothing changes).
-    ///< Changing DPI scale to 100% => m_rescaleFactor = 0.5 (ie: half of previous scale).
-    ///< Changing DPI scale to 200% => m_rescaleFactor = 2.0 (ie: double the previous scale).
-    ///< Changing DPI scale to 300% => m_rescaleFactor = 1.5 (ie: 1.5x the previous scale).
+    ///< An initial DPI scale of 200% => rescale_factor_ = 1.0. (ie: there is no previous scale, so nothing changes).
+    ///< Changing DPI scale to 100% => rescale_factor_ = 0.5 (ie: half of previous scale).
+    ///< Changing DPI scale to 200% => rescale_factor_ = 2.0 (ie: double the previous scale).
+    ///< Changing DPI scale to 300% => rescale_factor_ = 1.5 (ie: 1.5x the previous scale).
     double rescale_factor_;
 
     /// Font scale factor. QFontMetrics appears to calculate correctly at whatever the initial DPI scale is when the app is opened.
     /// Font PointSizes thus need to get scaled relative to that initial DPI.
-    /// If initial DPI Scale is 100%, then m_fontScaleFactor will always be equal to m_scaleFactor.
-    /// An initial DPI scale of 200% => m_fontScaleFactor = 1.0.
-    /// Changing DPI scale to 100% => m_fontScaleFactor = 0.5 (ie: half of initial scale).
-    /// Changing DPI scale to 200% => m_fontScaleFactor = 1.0 (ie: back at initial scale).
-    /// Changing DPI scale to 300% => m_fontScaleFactor = 1.5 (ie: 1.5x of initial scale).
+    /// If initial DPI Scale is 100%, then font_scale_factor_ will always be equal to scale_factor_.
+    /// An initial DPI scale of 200% => font_scale_factor_ = 1.0.
+    /// Changing DPI scale to 100% => font_scale_factor_ = 0.5 (ie: half of initial scale).
+    /// Changing DPI scale to 200% => font_scale_factor_ = 1.0 (ie: back at initial scale).
+    /// Changing DPI scale to 300% => font_scale_factor_ = 1.5 (ie: 1.5x of initial scale).
     double font_scale_factor_;
 
     /// Current screen DPI