[partition] Fix re-editing a newly created partition

- If there is a partition already (newly) created, then pass that
   to the dialog so that it can use the setings previously applied
   (e.g. mount point and flags).
 - This avoids the case where you create or format a partition,
   then click on it again to edit it and the previous settings are lost.

src/modules/partition/gui/CreatePartitionDialog.cpp

@@ -57,7 +57,7 @@ static QSet< FileSystem::Type > s_unmountableFS(
     FileSystem::Lvm2_PV
 } );
 
-CreatePartitionDialog::CreatePartitionDialog( Device* device, PartitionNode* parentPartition, const QStringList& usedMountPoints, QWidget* parentWidget )
+CreatePartitionDialog::CreatePartitionDialog( Device* device, PartitionNode* parentPartition, Partition* partition, const QStringList& usedMountPoints, QWidget* parentWidget )
     : QDialog( parentWidget )
     , m_ui( new Ui_CreatePartitionDialog )
     , m_partitionSizeController( new PartitionSizeController( this ) )
@@ -82,7 +82,7 @@ CreatePartitionDialog::CreatePartitionDialog( Device* device, PartitionNode* par
         m_ui->lvNameLineEdit->setValidator(validator);
     }
 
-    standardMountPoints( *(m_ui->mountPointComboBox) );
+    standardMountPoints( *(m_ui->mountPointComboBox), partition ? PartitionInfo::mountPoint( partition ) : QString() );
 
     if ( device->partitionTable()->type() == PartitionTable::msdos ||
          device->partitionTable()->type() == PartitionTable::msdos_sectorbased )
@@ -121,7 +121,7 @@ CreatePartitionDialog::CreatePartitionDialog( Device* device, PartitionNode* par
     m_ui->fsComboBox->setCurrentIndex( defaultFsIndex );
     updateMountPointUi();
 
-    setFlagList( *(m_ui->m_listFlags), static_cast< PartitionTable::Flags >( ~PartitionTable::Flags::Int(0) ), PartitionTable::Flags() );
+    setFlagList( *(m_ui->m_listFlags), static_cast< PartitionTable::Flags >( ~PartitionTable::Flags::Int(0) ), partition ? PartitionInfo::flags( partition ) : PartitionTable::Flags() );
 
     // Checks the initial selection.
     checkMountPointSelection();

src/modules/partition/gui/CreatePartitionDialog.h

@@ -42,7 +42,13 @@ class CreatePartitionDialog : public QDialog
 {
     Q_OBJECT
 public:
-    CreatePartitionDialog( Device* device, PartitionNode* parentPartition, const QStringList& usedMountPoints, QWidget* parentWidget = nullptr );
+    /**
+     * @brief Dialog for editing a new partition.
+     *
+     * For the (unlikely) case that a newly created partition is being re-edited,
+     * pass a pointer to that @p partition, otherwise pass nullptr.
+     */
+    CreatePartitionDialog( Device* device, PartitionNode* parentPartition, Partition* partition, const QStringList& usedMountPoints, QWidget* parentWidget = nullptr );
     ~CreatePartitionDialog();
 
     /**

src/modules/partition/gui/PartitionPage.cpp

@@ -190,6 +190,7 @@ PartitionPage::onCreateClicked()
 
     QPointer< CreatePartitionDialog > dlg = new CreatePartitionDialog( model->device(),
                                                                        partition->parent(),
+                                                                       nullptr,
                                                                        getCurrentUsedMountpoints(),
                                                                        this );
     dlg->initFromFreeSpace( partition );
@@ -285,6 +286,7 @@ PartitionPage::updatePartitionToCreate( Device* device, Partition* partition )
 
     QPointer< CreatePartitionDialog > dlg = new CreatePartitionDialog( device,
                                                                        partition->parent(),
+                                                                       partition,
                                                                        mountPoints,
                                                                        this );
     dlg->initFromPartitionToCreate( partition );