[kcms/baloo] Only show "Delete index?" message when there is an index

Otherwise it will always appear when indexing is disabled even after the
index has already been deleted.

BUG: 436354
FIXED-IN: 5.22

kcms/baloo/kcm.cpp

@@ -128,9 +128,14 @@ void ServerConfigModule::deleteIndex()
     QFile(balooDatabaseLocation()).remove();
 }
 
-QString ServerConfigModule::indexFileSize()
+int ServerConfigModule::rawIndexFileSize()
 {
-    return KFormat().formatByteSize(QFile(balooDatabaseLocation()).size());
+    return QFile(balooDatabaseLocation()).size();
+}
+
+QString ServerConfigModule::prettyIndexFileSize()
+{
+    return KFormat().formatByteSize(rawIndexFileSize());
 }
 
 #include "kcm.moc"

kcms/baloo/kcm.h

@@ -44,7 +44,8 @@ public:
     FilteredFolderModel *filteredModel() const;
 
     Q_INVOKABLE void deleteIndex();
-    Q_INVOKABLE QString indexFileSize();
+    Q_INVOKABLE int rawIndexFileSize();
+    Q_INVOKABLE QString prettyIndexFileSize();
 
 public Q_SLOTS:
     void load() override;

kcms/baloo/package/contents/ui/main.qml

@@ -62,10 +62,10 @@ KCM.SimpleKCM {
         Kirigami.InlineMessage {
             id: indexingDisabledWarning
             Layout.fillWidth: true
-            visible: !kcm.balooSettings.indexingEnabled && !kcm.needsSave
+            visible: !kcm.balooSettings.indexingEnabled && !kcm.needsSave && kcm.rawIndexFileSize() > 0
             type: Kirigami.MessageType.Warning
             showCloseButton: true
-            text: i18n("Do you want to delete the saved index data? %1 of space will be freed, but if indexing is re-enabled later, the entire index will have to be re-created from scratch. This may take some time, depending on how many files you have.", kcm.indexFileSize());
+            text: i18n("Do you want to delete the saved index data? %1 of space will be freed, but if indexing is re-enabled later, the entire index will have to be re-created from scratch. This may take some time, depending on how many files you have.", kcm.prettyIndexFileSize());
             actions: [
                 Kirigami.Action {
                     text: i18n("Delete Index Data")