Fix used and unused sector math when pasting a copied partition

This change is in preparation for supporting sectors sizes > 512 bytes.

src/Dialog_Partition_Copy.cc

@@ -143,6 +143,11 @@ void Dialog_Partition_Copy::Set_Data( const Partition & selected_partition, cons
 	this ->selected_partition .inside_extended = selected_partition .inside_extended ;
 	this ->selected_partition .type = 
 		selected_partition .inside_extended ? GParted::TYPE_LOGICAL : GParted::TYPE_PRIMARY ;
+	//Handle situation where src sector size is smaller than dst sector size and an additional partial dst sector is required.
+	this ->selected_partition .set_used(
+			( (copied_partition .sectors_used * copied_partition .sector_size)
+			  + (selected_partition .sector_size - 1)
+			) / selected_partition .sector_size ) ;
 
 	this ->show_all_children() ;
 }