Fix colors from KStatefulBrushes not using application colorschemes

Summary:
This fixes the colors of things like context menus and application menus

T11124#193132

Test Plan:
Old:
{F7096221}

New:
{F7248348}

Reviewers: #vdg, #breeze

Subscribers: hpereiradacosta, mglb, ngraham, plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D23170

kstyle/breezehelper.cpp

@@ -60,9 +60,9 @@ namespace Breeze
     //____________________________________________________________________
     void Helper::loadConfig()
     {
-        _viewFocusBrush = KStatefulBrush( KColorScheme::View, KColorScheme::FocusColor, _config );
-        _viewHoverBrush = KStatefulBrush( KColorScheme::View, KColorScheme::HoverColor, _config );
-        _viewNegativeTextBrush = KStatefulBrush( KColorScheme::View, KColorScheme::NegativeText, _config );
+        _viewFocusBrush = KStatefulBrush( KColorScheme::View, KColorScheme::FocusColor );
+        _viewHoverBrush = KStatefulBrush( KColorScheme::View, KColorScheme::HoverColor );
+        _viewNegativeTextBrush = KStatefulBrush( KColorScheme::View, KColorScheme::NegativeText );
 
         const QPalette palette( QApplication::palette() );
         const KConfigGroup group( _config->group( "WM" ) );

kstyle/breezestyle.cpp

@@ -194,9 +194,13 @@ namespace Breeze
             QStringLiteral( "/BreezeDecoration" ),
             QStringLiteral( "org.kde.Breeze.Style" ),
             QStringLiteral( "reparseConfiguration" ), this, SLOT(configurationChanged()) );
-#if !BREEZE_USE_KDE4
+        #if !BREEZE_USE_KDE4
+        #if QT_VERSION < 0x050D00 // Check if Qt version < 5.13
+        this->addEventFilter(qApp);
+        #else
         connect(qApp, &QApplication::paletteChanged, this, &Style::configurationChanged);
-#endif
+        #endif
+        #endif
         // call the slot directly; this initial call will set up things that also
         // need to be reset when the system palette changes
         loadConfiguration();
@@ -1024,6 +1028,9 @@ namespace Breeze
         #if QT_VERSION >= 0x050000
         else if( auto commandLinkButton = qobject_cast<QCommandLinkButton*>( object ) ) { return eventFilterCommandLinkButton( commandLinkButton, event ); }
         #endif
+        #if QT_VERSION < 0x050D00 // Check if Qt version < 5.13
+        else if( object == qApp && event->type() == QEvent::ApplicationPaletteChange ) { configurationChanged(); }
+        #endif
         // cast to QWidget
         QWidget *widget = static_cast<QWidget*>( object );
         if( widget->inherits( "QAbstractScrollArea" ) || widget->inherits( "KTextEditor::View" ) ) { return eventFilterScrollArea( widget, event ); }