Created custom BloomProxyStyle to override Qt system styles

src/Insight/UserInterfaces/InsightWindow/BloomProxyStyle.cpp

@@ -0,0 +1,16 @@
+#include "BloomProxyStyle.hpp"
+
+using namespace Bloom;
+
+int BloomProxyStyle::styleHint(
+    StyleHint hint,
+    const QStyleOption* option,
+    const QWidget* widget,
+    QStyleHintReturn* returnData
+) const {
+    if (hint == QStyle::SH_ComboBox_Popup) {
+        return 0;
+    }
+
+    return QProxyStyle::styleHint(hint, option, widget, returnData);
+}

src/Insight/UserInterfaces/InsightWindow/BloomProxyStyle.hpp

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <QProxyStyle>
+
+namespace Bloom
+{
+    class BloomProxyStyle: public QProxyStyle
+    {
+        Q_OBJECT
+
+    public:
+        int styleHint(
+            StyleHint hint,
+            const QStyleOption* option = nullptr,
+            const QWidget* widget = nullptr,
+            QStyleHintReturn* returnData = nullptr
+        ) const override;
+    };
+}