[gparted] Update file system usage last in prepare_new_partition() (#48)

[Curtis Gedak <gedakc src gnome org>]

commit 4101b0961bb1f3f6dc14125c7faf64b90b7405a0
Author: Mike Fleetwood <mike fleetwood googlemail com>
Date:   Fri May 10 07:53:52 2019 +0100

    Update file system usage last in prepare_new_partition() (#48)
    
    Move setting of the new_partition object file system usage to after
    everything else, specifically after free_space_before and strict_start.
    This is because snap_to_*() use free_space_before and strict_start and
    snap_to_alignment() is going to be called before the file system usage
    is updated to avoid the error in this bug report.
    
    Closes #48 - Error when moving locked LUKS-encrypted partition

 src/Dialog_Base_Partition.cc | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)
---
diff --git a/src/Dialog_Base_Partition.cc b/src/Dialog_Base_Partition.cc
index 37a6bc53..c9efec17 100644
--- a/src/Dialog_Base_Partition.cc
+++ b/src/Dialog_Base_Partition.cc
@@ -220,6 +220,12 @@ void Dialog_Base_Partition::prepare_new_partition()
                        break;
        }
 
+       new_partition->free_space_before = Sector(spinbutton_before.get_value_as_int()) * (MEBIBYTE / 
new_partition->sector_size);
+
+       // If the original before value has not changed, then set indicator to keep start sector unchanged.
+       if ( ORIG_BEFORE == spinbutton_before .get_value_as_int() )
+               new_partition->strict_start = TRUE;
+
        //update partition usage
        if ( new_partition->sector_usage_known() )
        {
@@ -240,12 +246,6 @@ void Dialog_Base_Partition::prepare_new_partition()
                        new_partition->set_sector_usage( new_size, new_size - new_partition->sectors_used );
                }
        }
-
-       new_partition->free_space_before = Sector(spinbutton_before.get_value_as_int()) * (MEBIBYTE / 
new_partition->sector_size);
-
-       //if the original before value has not changed, then set indicator to keep start sector unchanged
-       if ( ORIG_BEFORE == spinbutton_before .get_value_as_int() )
-               new_partition->strict_start = TRUE;
 }
 
 void Dialog_Base_Partition::Set_Confirm_Button( CONFIRMBUTTON button_type )