fix: [search functionality] Resolve issue with empty editor content

This commit addresses a bug where the search functionality would not
work when the editor content was empty. The following changes were made:

- Changed the `channelData` type to `std::optional<QString>` to
  handle cases where there may not be any data to send.

These changes ensure that the search operation can gracefully handle
empty input, improving the overall robustness of the search feature.

Log: Fix search issue when editor content is empty
Bug: https://pms.uniontech.com/bug-view-298499.html

src/plugins/find/gui/advancedsearchwidget.cpp

@@ -88,6 +88,7 @@ class AdvancedSearchWidgetPrivate : public QObject
     WindowService *winSrv { nullptr };
     MainController *controller { nullptr };
     QTimer startTimer;
+    bool isReplaceAll { false };
 };
 
 AdvancedSearchWidgetPrivate::AdvancedSearchWidgetPrivate(AdvancedSearchWidget *qq)
@@ -179,7 +180,7 @@ DToolButton *AdvancedSearchWidgetPrivate::registerOperator(const QIcon &icon, co
     btn->setIconSize({ 16, 16 });
     btn->setToolTip(description);
     connect(btn, &DToolButton::clicked, this, handler);
-    
+
     winSrv->registerWidgetToDockHeader(MWNA_ADVANCEDSEARCH, btn);
     return btn;
 }
@@ -461,19 +462,35 @@ void AdvancedSearchWidgetPrivate::handleReplaceAll()
     }
     // 0: cancel 1:contionue
     int code = showMessage(msg);
-    if (1 == code)
+    if (1 == code) {
+        isReplaceAll = true;
         replace(resultMap);
+    }
 }
 
 void AdvancedSearchWidgetPrivate::handleReplaceFinished()
 {
     searchSpinner->setVisible(false);
     searchSpinner->stop();
+    if (isReplaceAll) {
+        isReplaceAll = false;
+        const auto &results = resultWidget->allResult();
+        const auto &items = results.values();
+        const int resultCount = std::accumulate(items.cbegin(), items.cend(), 0,
+                                                [](int sum, const FindItemList &list) {
+                                                    return sum + list.size();
+                                                });
+        QString msg = AdvancedSearchWidget::tr("Replaced %1 occurrences across %2 files with \"%3\"");
+        resultWidget->clear();
+        resultWidget->showMessage(msg.arg(QString::number(results.count()),
+                                          QString::number(resultCount),
+                                          replaceEdit->text()));
+    }
 }
 
 AdvancedSearchWidget::AdvancedSearchWidget(QWidget *parent)
     : QWidget(parent),
-    d(new AdvancedSearchWidgetPrivate(this))
+      d(new AdvancedSearchWidgetPrivate(this))
 {
     d->initUI();
     d->initConnection();

src/plugins/find/maincontroller/worker/searchreplaceworker.cpp

@@ -43,8 +43,8 @@ void SearchReplaceWorkerPrivate::startNextJob()
     process->setProgram(job.program);
     process->setArguments(job.arguments);
     process->start();
-    if (!job.channelData.isEmpty()) {
-        process->write(job.channelData.toUtf8());
+    if (job.channelData.has_value()) {
+        process->write(job.channelData->toUtf8());
         process->closeWriteChannel();
     }
 }

src/plugins/find/maincontroller/worker/searchreplaceworker_p.h

@@ -17,7 +17,7 @@ class SearchReplaceWorkerPrivate : public QObject
     {
         QString program;
         QStringList arguments;
-        QString channelData;
+        std::optional<QString> channelData;
         QString keyword;
         SearchFlags flags;
     };