kstyle: fix dock title toolbar buttons not indicating selected/active state

BUG: 440231
FIXED-IN: 5.24.3

kstyle/breezestyle.cpp

@@ -4629,6 +4629,8 @@ namespace Breeze
             const QIcon::State iconState( sunken ? QIcon::On : QIcon::Off );
             QIcon::Mode iconMode;
             if( !enabled ) iconMode = QIcon::Disabled;
+            else if( !flat && hasFocus ) iconMode = QIcon::Selected;
+            else if( mouseOver && flat ) iconMode = QIcon::Active;
             else iconMode = QIcon::Normal;
 
             const QPixmap pixmap = _helper->coloredIcon(toolButtonOption->icon, toolButtonOption->palette, iconSize, iconMode, iconState);