fix undo/redo behavior for resizing gop subcanvas

17 jobs from add-constrained-dragging in 425 minutes and 31 seconds (queued for 53 minutes and 5 seconds)
Status Job ID Name Coverage
  Test
passed #10848
debian jessie i386
debian_jessie_i386_deb

00:34:47

passed #10849
debian jessie x86_64
debian_jessie_x86_64_deb

00:32:02

passed #10850
debian stretch x86_64
debian_stretch_x86_64_deb

00:33:23

passed #10854
osx v10.11 dmg
osx_10.11_x86_64_dmg

00:23:27

passed #10845
dmg v10.8 osx
osx_10.8_x86_64_dmg

00:20:07

passed #10847
stretch arm raspbian
raspbian_stretch_armv7l_deb

01:02:43

passed #10851
ubuntu v14.04 i386
ubuntu_14.04_i386_deb

00:40:02

passed #10852
ubuntu v14.04 x86_64
ubuntu_14.04_x86_64_deb

00:36:56

passed #10853
ubuntu v16.04 x86_64
ubuntu_16.04_x86_64_deb

00:48:28

passed #10846
i386 windows
windows_i386_innosetup

01:33:31

failed #10838
i386 jessie debian
debian_jessie_i386_deb

failed #10839
x86_64 jessie debian
debian_jessie_x86_64_deb

failed #10840
x86_64 stretch debian
debian_stretch_x86_64_deb

failed #10844
dmg v10.11 osx
osx_10.11_x86_64_dmg

failed #10841
i386 v14.04 ubuntu
ubuntu_14.04_i386_deb

failed #10842
x86_64 v14.04 ubuntu
ubuntu_14.04_x86_64_deb

failed #10843
x86_64 v16.04 ubuntu
ubuntu_16.04_x86_64_deb