[Cin] two patches for vframe.C and trackcanvas.C

[Georgy Salnikov]

On Mon, 11 Apr 2022, Andrea paz via Cin wrote:

> Tried both patches with no problems. No core dumps or error messages.
> Playback is similar to that with CinGG-appimage (without patches).

In the build system of CGG not all the actual dependencies on the C++ header
files are defined. It is very likely that a simple `make all' after change
in some .h header file will recompile some .C files and not recompile some
other .C files which depend on the changed header. A probable result will be
inconsistency in memory layout of the internal variables in the C++ object
whose header has been changed: for example, some assume frames are 16-byte
aligned, some other assume they are aligned differently. Such inconsistency
can manifest itself, most likely, in a SEGV, but any other quirks are also
possible.

To test if it could be the case is easy: a complete fresh build with
preceding clean-up of all the .o, .a, and .so files.
_______________________________________________________________________________

Georgy Salnikov
NMR Group
Novosibirsk Institute of Organic Chemistry
Lavrentjeva, 9, 630090 Novosibirsk, Russia
Phone   +7-383-3307864
Email   sge at nmr.nioch.nsc.ru
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