It is currently needed to resize partition (or any other device udisks support to resize) in two steps/calls -- first resize the device and after that the filesystem (or vice-versa when shrinking). We should add some special function or an option for existing functions to do this in one step.
Moving to 7.7.
After evaluating this issue, there are no plans to address it further or fix it in an upcoming release. Therefore, it is being closed. If plans change such that this issue will be fixed in an upcoming release, then the bug can be reopened.