fix bug: #96279 the background dose not follow the theme to change.

frontend/control/search-line-edit.cpp

@@ -75,6 +75,11 @@ SearchLineEdit::SearchLineEdit(QWidget *parent) : QLineEdit(parent) {
             m_timer->start(0.1 * 1000);
         }
     });
+
+    //跟随主题透明度变化
+    connect(qApp, &QApplication::paletteChanged, this, [=]() {
+        update();
+    });
 }
 
 SearchLineEdit::~SearchLineEdit() {

frontend/control/stack-pages/search-result-page.cpp

@@ -173,6 +173,10 @@ void SearchResultPage::initConnections()
         sendResizeWidthSignal(280);
     });
     connect(this, &SearchResultPage::setSelectionInfo, m_resultArea, &ResultArea::setSelectionInfo);
+    //跟随主题透明度变化
+    connect(qApp, &QApplication::paletteChanged, this, [=]() {
+        update();
+    });
 }
 
 void SearchResultPage::setupConnectionsForWidget(ResultWidget *widget)