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[clepsdyrae <myopenid@xxxxxxxxxxxxxxx>]

Would my .hugin help? Attached just in case.

> (Who the heck does such a ..., add mask and immediately delete it)

I found the bug by making two exclude-from-all-images-of-this-lens
masks: I was using the masks to control where the CP's are placed. After
the CPs are placed and the geometry optimized, I have to remove the
masks so I can stitch the pano (in this case using it to align an image
stack) without excluding that region of the images from the final
result.

But more generally, the bug happens (for me) any time I delete the last
of any kind of mask from a list of masks. It doesn't need to be done
immediately.

Fortunately the workaround is simple: don't delete the last mask. If I
delete the first (or second, as long as it is not the last) it works
fine. (This is why I guessed it was a fencepost error...)


** Attachment added: ".hugin"
   https://bugs.launchpad.net/hugin/+bug/1698048/+attachment/4896689/+files/.hugin

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https://bugs.launchpad.net/bugs/1698048

Title:
  faile assertion when deleting mask

Status in Hugin:
  Fix Committed

Bug description:
  I'm getting a failed assertion dialog when trying to delete a mask
  when there is more than one mask.

  To recreate:
  * start hugin, add one image, go to masks tab
  * add an "exclude region from all images of this lens" mask
  * add a second mask
  * click "Delete mask"
  * failed assertion window appears

  If I select the first mask before clicking delete, it works.

  Fencepost error?

  ---------------

  This is latest nightly on Kubuntu 16.10: 2017.1.0.6a5ba6861da0
  libpano13: 2.9.19 
  Boost: 1.61.0
  Exiv2: 0.25
  SQLite3: 3.14.1
  Vigra: 1.11.0
  LittleCMS2: 2.7

  Let me know if you have trouble reproducing.

  Thanks!

  ---------------------

  Backtrace:

  ASSERT INFO:
  ../src/generic/listctrl.cpp(3386): assert "litem >= 0 && (size_t)litem < GetItemCount()" failed in SetItemState(): invalid list ctrl item index in SetItem

  BACKTRACE:
  [1] wxGenericListCtrl::SetItemState(long, long, long)
  [2] MaskEditorPanel::panoramaImagesChanged(HuginBase::Panorama&, std::set<unsigned int, std::less<unsigned int>, std::allocator<unsigned int> > const&)
  [3] HuginBase::Panorama::changeFinished(bool)
  [4] PanoCommand::PanoCommand::execute()
  [5] PanoCommand::CommandHistory::addCommand(PanoCommand::PanoCommand*, bool)
  [6] MaskEditorPanel::OnMaskDelete(wxCommandEvent&)
  [7] wxAppConsoleBase::CallEventHandler(wxEvtHandler*, wxEventFunctor&, wxEvent&) const
  [8] wxEvtHandler::ProcessEventIfMatchesId(wxEventTableEntryBase const&, wxEvtHandler*, wxEvent&)
  [9] wxEventHashTable::HandleEvent(wxEvent&, wxEvtHandler*)
  [10] wxEvtHandler::TryHereOnly(wxEvent&)
  [11] wxEvtHandler::ProcessEventLocally(wxEvent&)
  [12] wxEvtHandler::ProcessEvent(wxEvent&)
  [13] wxWindowBase::TryAfter(wxEvent&)
  [14] wxWindowBase::TryAfter(wxEvent&)
  [15] wxWindowBase::TryAfter(wxEvent&)
  [16] wxWindowBase::TryAfter(wxEvent&)
  [17] wxEvtHandler::SafelyProcessEvent(wxEvent&)
  [18] g_closure_invoke
  [19] g_signal_emit_valist
  [20] g_signal_emit
  [21] g_closure_invoke
  [22] g_signal_emit_valist
  [23] g_signal_emit
  [24] g_closure_invoke
  [25] g_signal_emit_valist
  [26] g_signal_emit
  [27] gtk_propagate_event
  [28] gtk_main_do_event
  [29] g_main_context_dispatch
  [30] g_main_loop_run
  [31] gtk_main
  [32] wxGUIEventLoop::DoRun()
  [33] wxEventLoopBase::Run()
  [34] wxAppConsoleBase::MainLoop()
  [35] wxEntry(int&, wchar_t**)
  [36] main
  [37] __libc_start_main
  [38] _start

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