Description of problem:
Manually setting partition exceeding its size.

Version-Release number of selected component:
anaconda-core-23.19.10-1.fc23.x86_64

The following was filed automatically by anaconda:
anaconda 23.19.10-1 exception report
Traceback (most recent call first):
  File "/usr/lib/python3.4/site-packages/blivet/deviceaction.py", line 436, in __init__
    raise ValueError("new size same as old size")
  File "/usr/lib/python3.4/site-packages/blivet/blivet.py", line 1160, in resizeDevice
    self.devicetree.registerAction(action_class(device, new_size))
  File "/usr/lib64/python3.4/site-packages/pyanaconda/ui/gui/spokes/custom.py", line 798, in _handle_size_change
    self._storage_playground.resizeDevice(use_dev, use_size)
  File "/usr/lib64/python3.4/site-packages/pyanaconda/ui/gui/spokes/custom.py", line 135, in decorated
    return func(*args, **kwargs)
  File "/usr/lib64/python3.4/site-packages/pyanaconda/ui/gui/spokes/custom.py", line 1206, in _save_right_side
    self._handle_size_change(size, old_size, device)
  File "/usr/lib64/python3.4/site-packages/pyanaconda/ui/gui/spokes/custom.py", line 2690, in on_update_settings_clicked
    self._save_right_side(self._current_selector)
  File "/usr/lib64/python3.4/site-packages/pyanaconda/ui/gui/utils.py", line 269, in _run_once_one_arg
    self._func(*args, **kwargs)
ValueError: new size same as old size

Additional info:
cmdline:        /usr/bin/python3  /sbin/anaconda --liveinst --method=livecd:///dev/mapper/live-base
cmdline_file:   BOOT_IMAGE=/syslinux/vmlinuz0 root=live:LABEL=LIVE ro rd.live.image quiet rhgb rd.live.check
executable:     /sbin/anaconda
hashmarkername: anaconda
kernel:         4.2.3-300.fc23.x86_64
other involved packages: python3-blivet-1.12.8-1.fc23.noarch, anaconda-gui-23.19.10-1.fc23.x86_64
product:        Fedora
release:        Fedora release 23 (Twenty Three)
type:           anaconda
version:        23