Default Crop mode is confusing

[Wes]

From https://gitlab.gnome.org/GNOME/shotwell/issues/68

Steps to reproduce:
 - Open an image in Shotwell with default config.
 - Select Crop tool
 - Select area to crop, try to drag crop area horizontally.

What was actually happening

Crop tool uses Square mode by default, which prevents horizontal adjustment. This is an astonishing behaviour.

The expected behaviour

When I crop an image, the crop tool uses Unconstrained mode by default.
This is the sane default, found in every other image editor I have used.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: shotwell 0.28.2-0ubuntu1
ProcVersionSignature: User Name 4.15.0-38.41-generic 4.15.18
Uname: Linux 4.15.0-38-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.4
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Mon Oct 29 12:11:45 2018
EcryptfsInUse: Yes
InstallationDate: Installed on 2018-09-12 (46 days ago)
InstallationMedia: Ubuntu 16.04.5 LTS "Xenial Xerus" - Release amd64 (20180731)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: shotwell
UpgradeStatus: Upgraded to bionic on 2018-09-28 (30 days ago)

[Howe I. Shotweb (howeishotweb)]

Still a problem in Shotwell 0.30.10 on Ubuntu 20.04.