Commits on Jun 14, 2020

1. Check for null pointer returned by getLastVectorImageAtFrame where re… …

   …levant
   
   There are places that only have a Q_CHECK_PTR because they
   follow a call to ScribbleArea::handleDrawingOnEmptyFrame which
   should guarantee a frame after invocation. However this is called only
   at the start of a stroke typically, which means that if the frame is
   deleted while the stroke is in progress (ex. with a shortcut), then
   it will still crash without a check. Users who aren't trying to break
   the program will likely never do this, but we might as well add the
   checks if we know the issue is there.

   

   scribblemaniac committed Jun 14, 2020
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   f61b6ad View commit details

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2. Check for null pointer returned by getLastBitmapImageAtFrame where re… …

   …levant
   
   See commit message of f61b6ad. This is the same thing execpt for
   bitmaps.

   

   scribblemaniac committed Jun 14, 2020
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3. Fix unhandled cases where LastFrameAtFrame returns -1 …

   This was causing crashes when there were no previous frames on any
   layer.

   

   scribblemaniac committed Jun 14, 2020
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   b58207e View commit details

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