Test out a way to make the rescan asynchronous.

src/modules/partition/gui/ChoicePage.cpp

@@ -46,6 +46,8 @@
 #include <QDir>
 #include <QLabel>
 #include <QListView>
+#include <QFutureWatcher>
+#include <QtConcurrent/QtConcurrent>
 
 
 
@@ -437,21 +439,35 @@ ChoicePage::applyActionChoice( ChoicePage::Choice choice )
         connect( m_beforePartitionBarsView->selectionModel(), &QItemSelectionModel::currentRowChanged,
                  this, [ this ]( const QModelIndex& current, const QModelIndex& previous )
         {
+            auto doReplace = [=]
+            {
+                // We can't use the PartitionPtrRole because we need to make changes to the
+                // main DeviceModel, not the immutable copy.
+                QString partPath = current.data( PartitionModel::PartitionPathRole ).toString();
+                Partition* partition = KPMHelpers::findPartitionByPath( { selectedDevice() },
+                                                                        partPath );
+                if ( partition )
+                    PartitionActions::doReplacePartition( m_core,
+                                                          selectedDevice(),
+                                                          partition );
+            };
+
             if ( m_core->isDirty() )
             {
-                m_core->revertDevice( selectedDevice() );
+                QFutureWatcher< void > watcher;
-                m_core->clearJobs();
+                connect( &watcher, &QFutureWatcher< void >::finished,
+                         this, doReplace );
+
+                QFuture< void > future = QtConcurrent::run( [=]
+                {
+                    m_core->revertDevice( selectedDevice() );
+                    m_core->clearJobs();
+                } );
+                watcher.setFuture( future );
             }
+            else
+                doReplace();
 
-            // We can't use the PartitionPtrRole because we need to make changes to the
-            // main DeviceModel, not the immutable copy.
-            QString partPath = current.data( PartitionModel::PartitionPathRole ).toString();
-            Partition* partition = KPMHelpers::findPartitionByPath( { selectedDevice() },
-                                                                    partPath );
-            if ( partition )
-                PartitionActions::doReplacePartition( m_core,
-                                                      selectedDevice(),
-                                                      partition );
         } );
         break;
     case NoChoice: