Index: kstyle/breezehelper.cpp
===================================================================
--- kstyle/breezehelper.cpp
+++ kstyle/breezehelper.cpp
@@ -534,7 +534,7 @@
         if( !outline.isValid() ) return;
 
         // adjust rect
-        QRectF frameRect( rect.adjusted( 1, 1, -1, -1 ) );
+        QRectF frameRect( rect );
         frameRect.adjust( 0.5, 0.5, -0.5, -0.5 );
 
         // setup painter
@@ -546,22 +546,18 @@
         {
             default:
             case SideLeft:
-            frameRect.adjust( 0, 1, 0, -1 );
             painter->drawLine( frameRect.topRight(), frameRect.bottomRight() );
             break;
 
             case SideTop:
-            frameRect.adjust( 1, 0, -1, 0 );
             painter->drawLine( frameRect.topLeft(), frameRect.topRight() );
             break;
 
             case SideRight:
-            frameRect.adjust( 0, 1, 0, -1 );
             painter->drawLine( frameRect.topLeft(), frameRect.bottomLeft() );
             break;
 
             case SideBottom:
-            frameRect.adjust( 1, 0, -1, 0 );
             painter->drawLine( frameRect.bottomLeft(), frameRect.bottomRight() );
             break;
 
Index: kstyle/breezestyle.cpp
===================================================================
--- kstyle/breezestyle.cpp
+++ kstyle/breezestyle.cpp
@@ -397,48 +397,28 @@
         { scrollArea->setProperty( PropertyNames::sidePanelView, true ); }
 
         // for all side view panels, unbold font (design choice)
-        if( scrollArea->property( PropertyNames::sidePanelView ).toBool() )
+        const bool isSidePanel( scrollArea->property( PropertyNames::sidePanelView ).toBool() );
+        if( isSidePanel )
         {
             // upbold list font
             auto font( scrollArea->font() );
             font.setBold( false );
             scrollArea->setFont( font );
 
-            // adjust background role
-            if( !StyleConfigData::sidePanelDrawFrame() )
-            {
-                scrollArea->setBackgroundRole( QPalette::Window );
-                scrollArea->setForegroundRole( QPalette::WindowText );
-
-                if( scrollArea->viewport() )
-                {
-                    scrollArea->viewport()->setBackgroundRole( QPalette::Window );
-                    scrollArea->viewport()->setForegroundRole( QPalette::WindowText );
-                }
-
-                // QTreeView animates expanding/collapsing branches. It paints them into a
-                // temp pixmap whose background is unconditionally filled with the palette's
-                // *base* color which is usually different from the window's color
-                // cf. QTreeViewPrivate::renderTreeToPixmapForAnimation()
-                if ( auto treeView = qobject_cast<QTreeView *>( scrollArea ) ) {
-                    if (treeView->isAnimated()) {
-                        QPalette pal( treeView->palette() );
-                        pal.setColor( QPalette::Active, QPalette::Base, treeView->palette().color( treeView->backgroundRole() ) );
-                        treeView->setPalette(pal);
-                    }
-                }
-            }
+            scrollArea->setBackgroundRole( QPalette::Base );
+            scrollArea->setForegroundRole( QPalette::Text );
+            scrollArea->setAutoFillBackground(true);
 
         }
 
         // disable autofill background for flat (== NoFrame) scrollareas, with QPalette::Window as a background
         // this fixes flat scrollareas placed in a tinted widget, such as groupboxes, tabwidgets or framed dock-widgets
-        if( !(scrollArea->frameShape() == QFrame::NoFrame || scrollArea->backgroundRole() == QPalette::Window ) )
+        if( !(scrollArea->frameShape() == QFrame::NoFrame || scrollArea->backgroundRole() == QPalette::Window || isSidePanel ) )
         { return; }
 
         // get viewport and check background role
         auto viewport( scrollArea->viewport() );
-        if( !( viewport && viewport->backgroundRole() == QPalette::Window ) ) return;
+        if( !( viewport && ( viewport->backgroundRole() == QPalette::Window || isSidePanel ) ) ) return;
 
         // change viewport autoFill background.
         // do the same for all children if the background role is QPalette::Window
@@ -490,7 +470,8 @@
             // frame width
             case PM_DefaultFrameWidth:
             if( qobject_cast<const QMenu*>( widget ) ) return Metrics::Menu_FrameWidth;
-            if( qobject_cast<const QLineEdit*>( widget ) ) return Metrics::LineEdit_FrameWidth;
+            else if( qobject_cast<const QLineEdit*>( widget ) ) return Metrics::LineEdit_FrameWidth;
+            else if( widget && widget->property( PropertyNames::sidePanelView ).toBool() ) return 0;
             #if QT_VERSION >= 0x050000
             else if( isQtQuickControl( option, widget ) )
             {