Description of problem:
I tried to resize an ext4 partition on a 3tb external usb disk.
I ran su -c "blivet-gui", clicked "edit" on the partition, entered the new size and clicked "ok" or whatever the name of the button is.

Version-Release number of selected component:
blivet-gui-0.2.4-1.fc22.noarch

Additional info:
reporter:       libreport-2.5.1
blivet-gui.log: 
cmdline:        /usr/bin/python  /usr/bin/blivet-gui
executable:     /usr/bin/blivet-gui
hashmarkername: blivet-gui
kernel:         4.0.4-300.fc22.x86_64
other involved packages: python-blivet-1.0.9-1.fc22.noarch
product:        Fedora
release:        Fedora release 22 (Twenty Two)
type:           Python
version:        22

Truncated backtrace:
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/blivetgui/blivetgui.py", line 278, in edit_device
    self._raise_exception(result.exception, result.traceback)
  File "/usr/lib/python2.7/site-packages/blivetgui/blivetgui.py", line 236, in _raise_exception
    raise six.reraise(type(exception), exception, traceback)
  File "/usr/lib/python2.7/site-packages/blivetgui/utils.py", line 551, in edit_partition_device
    self.storage.devicetree.registerAction(ac)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 493, in registerAction
    action.apply()
  File "/usr/lib/python2.7/site-packages/blivet/deviceaction.py", line 452, in apply
    self.device.targetSize = self._targetSize
  File "/usr/lib/python2.7/site-packages/blivet/devices/storage.py", line 275, in <lambda>
    lambda s, v: s._setTargetSize(v),
  File "/usr/lib/python2.7/site-packages/blivet/devices/partition.py", line 260, in _setTargetSize
    raise ValueError("new size will not yield an aligned partition")
ValueError: new size will not yield an aligned partition