Add variable to enable/disable check indexing

kmail/src/kmkernel.cpp

@@ -1680,8 +1680,9 @@ void KMKernel::slotRunBackgroundTasks() // called regularly by timer
     if (KMailSettings::self()->autoExpiring()) {
         mFolderCollectionMonitor->expireAllFolders(false /*scheduled, not immediate*/, entityTreeModel());
     }
-
-    mCheckIndexingManager->start(entityTreeModel());
+    if (KMailSettings::self()->checkCollectionsIndexing()) {
+        mCheckIndexingManager->start(entityTreeModel());
+    }
 #ifdef DEBUG_SCHEDULER // for debugging, see jobscheduler.h
     mBackgroundTasksTimer->start(60 * 1000);   // check again in 1 minute
 #else

kmail/src/settings/kmail.kcfg.cmake

@@ -127,6 +127,9 @@
         <label>Ask for confirmation before moving all messages to trash</label>
         <default>true</default>
       </entry>
+      <entry name="CheckCollectionsIndexing" type="Bool" key="check-collections-indexing">
+        <default>true</default>
+      </entry>
       <entry name="AutoExpiring" type="Bool" key="auto-expiring">
         <label>Specifies whether the folders will expire in the background (for internal use only)</label>
         <default>true</default>