Fedora下的图像查看软件Shotwell,当关闭了它的Crop dialog之后,无论怎么点击Crop按钮都打不开它了。
解决方法是:
https://askubuntu.com/questions/530252/shotwell-crop-dialog-has-disappeared

执行这个命令即可:
gsettings reset-recursively org.yorba.shotwell.crop-settings