hmm - I don't seem to have the rights to add artful and zesty as the
affected series.  Please can someone add these?

Enc are two debdiff patches - one for artful, one for zesty.

I've built and tested these via my PPA here https://launchpad.net
/~ubuntubudgie-dev/+archive/ubuntu/testwebkit2gtk/+packages

** Description changed:

+ [Impact]
+ In discussion with Jeremy Bicha 
(https://bugs.launchpad.net/ubuntu/+source/budgie-welcome/+bug/1713210), the 
2.7 or latest version of webkit2gtk is due to be SRU'd to 16.04 & 17.04.
+ 
+ During artful testing, budgie-welcome segmentation faulted when running
+ with the 2.7 series of webkit2gtk.
+ 
+ An initial workaround fix was applied to artful (LP: #1713210). Later
+ discussions with upstream webkit2gtk indicated that the real reason why
+ the segmentation fault occurred was due to calling GTK+ calls whilst
+ inside a python thread. All GTK+ calls must be performed on the main
+ loop thread.
+ 
+ The impact of this issue is that the initial workaround fix for artful
+ is no longer required and can be rewritten as recommended by upstream.
+ 
+ The additional impact of this issue is that the 17.04 version of budgie-
+ welcome would be similarly affected once new SRU'd version of webkit2gtk
+ enters the archive.
+ 
+ [Test Case]
+ The code streams have slightly diverged so its not possible to cherry-pick 
the same patch from artful to zesty.
+ Thus the debdiffs are subtly different between the two versions of 
budgie-welcome. The same principles have occurred to make the two debdiff's - 
searching for direct webkit calls and converting these to equivalent calls but 
on the main thread.
+ 
+ Artful testcase: As per this bug-report, perform the following actions that 
are known to end with a segmentation fault.
+ 1. open the recommendation page
+ 2. open the budgie-applets page
+ 3. open the getting started page
+ 4. Install and remove a web-browser from the getting started page
+ 5. Install an application from the recommendation page
+ 6. Install and remove a budgie-applet from the budgie-applets page
+ 
+ Zesty testcase: With the current 2.6 series of webkit2gtk, perform the 
following actions to ensure they continue to work - i.e. regression tests
+ 1. open the recommendation page
+ 2. open the getting started page
+ 3. Install and remove a web-browser from the getting started page
+ 4. Install an application from the recommendation page
+ 
+ Upgrade Zesty with a backported version of the current artful 2.7 series of 
webkit2gtk (i.e. the version that would cause segmentation faults).
+ Repeat the above Zesty test case to ensure that segmentation faults do not 
occur
+ 
+ [Regression Potential]
+ It is possible that not all GTK+ based calls from a thread have been 
converted correctly and thus segmentation faults will still occur.
+ The mitigation here is that Artful is still in its beta test phase and any 
further issues can be addressed and analysis of the zesty code-stream can be 
performed to confirm if the same issue is likely and thus can be fixed before 
webkit2gtk is SRU'd
+ 
+ 
+ [Original Description]
  On first login to Ubuntu Budgie, budgie-welcome is run.
  
  This crashes immediately.
  
  This has only started to occur since the new version of webkit2gtk was
  uploaded on Friday libwebkit2gtk-4.0-37
  
  to reproduce - login to Ubuntu Budgie.  Delete the "firstrun" file and
  then run budgie-welcome
  
  i.e.
  
- dad@dad-VirtualBox:~$ rm ~/.config/budgie-welcome/firstrun 
- dad@dad-VirtualBox:~$ budgie-welcome 
+ dad@dad-VirtualBox:~$ rm ~/.config/budgie-welcome/firstrun
+ dad@dad-VirtualBox:~$ budgie-welcome
  1   0x7fcb99d8a287 
/usr/lib/x86_64-linux-gnu/libjavascriptcoregtk-4.0.so.18(WTFCrash+0x17) 
[0x7fcb99d8a287]
  2   0x7fcb9aceccca 
/usr/lib/x86_64-linux-gnu/libwebkit2gtk-4.0.so.37(+0x63dcca) [0x7fcb9aceccca]
  3   0x7fcb9ace182c 
/usr/lib/x86_64-linux-gnu/libwebkit2gtk-4.0.so.37(+0x63282c) [0x7fcb9ace182c]
  4   0x7fcb9aeb9463 
/usr/lib/x86_64-linux-gnu/libwebkit2gtk-4.0.so.37(webkit_web_view_run_javascript+0xc3)
 [0x7fcb9aeb9463]
  5   0x7fcba93d9e18 
/usr/lib/x86_64-linux-gnu/libffi.so.6(ffi_call_unix64+0x4c) [0x7fcba93d9e18]
  6   0x7fcba93d987a /usr/lib/x86_64-linux-gnu/libffi.so.6(ffi_call+0x32a) 
[0x7fcba93d987a]
  7   0x7fcba9b6f9cc 
/usr/lib/python3/dist-packages/gi/_gi.cpython-36m-x86_64-linux-gnu.so(+0x2b9cc) 
[0x7fcba9b6f9cc]
  8   0x7fcba9b714b8 
/usr/lib/python3/dist-packages/gi/_gi.cpython-36m-x86_64-linux-gnu.so(+0x2d4b8) 
[0x7fcba9b714b8]
  9   0x7fcba9b65209 
/usr/lib/python3/dist-packages/gi/_gi.cpython-36m-x86_64-linux-gnu.so(+0x21209) 
[0x7fcba9b65209]
  10  0x4591b3 /usr/bin/python3(_PyObject_FastCallDict+0xa3) [0x4591b3]
  11  0x54e607 /usr/bin/python3() [0x54e607]
  12  0x552f9b /usr/bin/python3(_PyEval_EvalFrameDefault+0x36ab) [0x552f9b]
  13  0x54e4b1 /usr/bin/python3() [0x54e4b1]
  14  0x54e73d /usr/bin/python3() [0x54e73d]
  15  0x552f9b /usr/bin/python3(_PyEval_EvalFrameDefault+0x36ab) [0x552f9b]
  16  0x54da88 /usr/bin/python3() [0x54da88]
  17  0x55772e /usr/bin/python3(_PyFunction_FastCallDict+0x2be) [0x55772e]
  18  0x459531 /usr/bin/python3(_PyObject_Call_Prepend+0x231) [0x459531]
  19  0x458fbe /usr/bin/python3(PyObject_Call+0x3e) [0x458fbe]
  20  0x551497 /usr/bin/python3(_PyEval_EvalFrameDefault+0x1ba7) [0x551497]
  21  0x54da88 /usr/bin/python3() [0x54da88]
  22  0x54e9e6 /usr/bin/python3() [0x54e9e6]
  23  0x552f9b /usr/bin/python3(_PyEval_EvalFrameDefault+0x36ab) [0x552f9b]
  24  0x54da88 /usr/bin/python3() [0x54da88]
  25  0x54e9e6 /usr/bin/python3() [0x54e9e6]
  26  0x552f9b /usr/bin/python3(_PyEval_EvalFrameDefault+0x36ab) [0x552f9b]
  27  0x54da88 /usr/bin/python3() [0x54da88]
  28  0x55772e /usr/bin/python3(_PyFunction_FastCallDict+0x2be) [0x55772e]
  29  0x459531 /usr/bin/python3(_PyObject_Call_Prepend+0x231) [0x459531]
  30  0x458fbe /usr/bin/python3(PyObject_Call+0x3e) [0x458fbe]
  31  0x58db52 /usr/bin/python3() [0x58db52]
  Segmentation fault
  dad@dad-VirtualBox:~$ Error sending IPC message: Broken pipe
  
  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: libwebkit2gtk-4.0-37 2.17.91-1ubuntu1
  ProcVersionSignature: Ubuntu 4.12.0-11.12-generic 4.12.5
  Uname: Linux 4.12.0-11-generic x86_64
  ApportVersion: 2.20.6-0ubuntu6
  Architecture: amd64
  CurrentDesktop: Budgie:GNOME
  Date: Mon Aug 21 11:22:08 2017
  InstallationDate: Installed on 2017-08-21 (0 days ago)
  InstallationMedia: Ubuntu-Budgie 17.10 "Artful Aardvark" - Alpha amd64 
(20170820)
  SourcePackage: webkit2gtk
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/1712047

Title:
  SRU: Budgie-Welcome to support 2.7 series of webkit2gtk

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