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testfw: use waveform layout files for gtkwave

Martin Jeřábek requested to merge gtkw-gui into master

In gui mode, gtkwave now starts with the associated layout. Note that this works only with the modified VUnit (prints warning otherwise).

The layout:

  • may be specified in gtkw key in YAML config (similar to wave)
  • is generated from the TCL wave file

It is tested with most tests (feature, sanity, a few unit tests) and generally should work. Please upgrade your docker image before trying it out. Also note that you need to run the tests with --create-ghws first. If something does not work, read the warnings and testwf/README.md.

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