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RHEL8 system gdb currently ships gdb-8.2. The bug discussed here was introduced
with the source highlighting feature introduced in gdb-8.3. Moving this to DTS9.

This is addressed in GTS10 already [it is part of FSF GDB 9.2 release]:

2019-10-24  H.J. Lu  <hongjiu.lu>

        PR gdb/25126
        * symfile.c (reread_symbols): Call forget_cached_source_info to
        clear the stale source cache.

The test from Sergio is missing, but it is (obviously) not needed.

Closing.