better appearance of tool button

NEWS.md

@@ -2,7 +2,7 @@ Version 0.6.8
  - enhancement: add link to cppreference in the help menu
  - fix: add mutex lock to prevent editor crash in rare conditions
  - fix: In the create project dialog, the browser button doesn't work
- - change: use QStyle to implement the dark style
+ - enhancement: use QStyle to implement the dark style, and better control of the style's look and feel 
 
 Version 0.6.7
  - fix: messages send to the gdb process's standard error are not received

RedPandaIDE/mainwindow.ui

@@ -283,7 +283,7 @@
         <enum>QTabWidget::South</enum>
        </property>
        <property name="currentIndex">
-        <number>2</number>
+        <number>0</number>
        </property>
        <widget class="QWidget" name="tabIssues">
         <attribute name="icon">

RedPandaIDE/widgets/darkfusionstyle.cpp

@@ -709,7 +709,7 @@ void DarkFusionStyle::drawPrimitive(PrimitiveElement elem, const QStyleOption *o
 
         QLinearGradient gradient = qt_fusion_gradient(rect, (isEnabled && option->state & State_MouseOver ) ? buttonColor : buttonColor.darker(104));
         p->setPen(Qt::transparent);
-        p->setBrush(isDown ? QBrush(buttonColor.darker(110)) : gradient);
+        p->setBrush(isDown ? QBrush(buttonColor.lighter(250)) : gradient);
         p->drawRoundedRect(r, 2.0, 2.0);
         p->setBrush(Qt::NoBrush);