Description of problem:
go to manual paritioning, with a disk with a previous f18 intance (in my case)
delete one partition
select one partition, change its size to a ridiculous big amount,  aconda correclty refuses such size.
select one partition, change its size to zero, aconda correclty refuses such size.
select one partition, change its size to a ridiculous big amount,  aconda crashes!


Version-Release number of selected component:
anaconda-18.19

Additional info:
libreport version: 2.0.14
cmdline:        /usr/bin/python  /sbin/anaconda
kernel:         3.6.1-1.fc18.x86_64

description:
:The following was filed automatically by anaconda:
:anaconda 18.19 exception report
:Traceback (most recent call first):
:  File "/usr/lib64/python2.7/site-packages/pyanaconda/storage/deviceaction.py", line 355, in __init__
:    raise ValueError("new size same as old size")
:  File "/usr/lib64/python2.7/site-packages/pyanaconda/storage/__init__.py", line 1261, in resizeDevice
:    self.devicetree.registerAction(action_class(device, new_size))
:  File "/usr/lib64/python2.7/site-packages/pyanaconda/ui/gui/spokes/custom.py", line 1097, in _save_right_side
:    self.__storage.resizeDevice(device, size)
:  File "/usr/lib64/python2.7/site-packages/pyanaconda/ui/gui/spokes/custom.py", line 1994, in on_apply_clicked
:    self._save_right_side(self._current_selector)
:ValueError: new size same as old size