[partition] Simplify flags calculations

- factor out the flags-we-want from the flags-we-already-have
 - the use of ->activeFlags() meant that the state on *disk* was
   being compared with the flags-we-want; if a partition was re-edited,
   then you couldn't change the flags back to the state-on-disk
   (eg. enable a flag, then change your mind and disable it).
 - set the flags before refreshing the partition, because the
   refresh checks for EFI bootability and that needs the new flags,
   not the old ones.

src/modules/partition/gui/EditExistingPartitionDialog.cpp

@@ -147,6 +147,9 @@ EditExistingPartitionDialog::applyChanges( PartitionCoreModule* core )
             : FileSystem::typeForName( m_ui->fileSystemComboBox->currentText() );
     }
 
+    const auto resultFlags = newFlags();
+    const auto currentFlags = PartitionInfo::flags( m_partition );
+
     if ( partResizedMoved )
     {
         if ( m_ui->formatRadioButton->isChecked() )
@@ -157,20 +160,20 @@ EditExistingPartitionDialog::applyChanges( PartitionCoreModule* core )
                                                                       fsType,
                                                                       newFirstSector,
                                                                       newLastSector,
-                                                                      newFlags() );
+                                                                      resultFlags );
             PartitionInfo::setMountPoint( newPartition, PartitionInfo::mountPoint( m_partition ) );
             PartitionInfo::setFormat( newPartition, true );
 
             core->deletePartition( m_device, m_partition );
             core->createPartition( m_device, newPartition );
-            core->setPartitionFlags( m_device, newPartition, newFlags() );
+            core->setPartitionFlags( m_device, newPartition, resultFlags );
         }
         else
         {
             core->resizePartition( m_device, m_partition, newFirstSector, newLastSector );
-            if ( m_partition->activeFlags() != newFlags() )
+            if ( currentFlags != resultFlags )
             {
-                core->setPartitionFlags( m_device, m_partition, newFlags() );
+                core->setPartitionFlags( m_device, m_partition, resultFlags );
             }
         }
     }
@@ -183,9 +186,9 @@ EditExistingPartitionDialog::applyChanges( PartitionCoreModule* core )
             if ( m_partition->fileSystem().type() == fsType )
             {
                 core->formatPartition( m_device, m_partition );
-                if ( m_partition->activeFlags() != newFlags() )
+                if ( currentFlags != resultFlags )
                 {
-                    core->setPartitionFlags( m_device, m_partition, newFlags() );
+                    core->setPartitionFlags( m_device, m_partition, resultFlags );
                 }
             }
             else  // otherwise, we delete and recreate the partition with new fs type
@@ -196,22 +199,22 @@ EditExistingPartitionDialog::applyChanges( PartitionCoreModule* core )
                                                                           fsType,
                                                                           m_partition->firstSector(),
                                                                           m_partition->lastSector(),
-                                                                          newFlags() );
+                                                                          resultFlags );
                 PartitionInfo::setMountPoint( newPartition, PartitionInfo::mountPoint( m_partition ) );
                 PartitionInfo::setFormat( newPartition, true );
 
                 core->deletePartition( m_device, m_partition );
                 core->createPartition( m_device, newPartition );
-                core->setPartitionFlags( m_device, newPartition, newFlags() );
+                core->setPartitionFlags( m_device, newPartition, resultFlags );
             }
         }
         else
         {
-            core->refreshPartition( m_device, m_partition );
-            if ( m_partition->activeFlags() != newFlags() )
+            if ( currentFlags != resultFlags )
             {
-                core->setPartitionFlags( m_device, m_partition, newFlags() );
+                core->setPartitionFlags( m_device, m_partition, resultFlags );
             }
+            core->refreshPartition( m_device, m_partition );
         }
     }
 }