Same transition dirs when only cmd line options differs
Ignore user defined build settings only set on
command line and not affected by any transition,
when calculating transitionDirectoryNameFragment
output directory.
Native options on command line already have this
behavior, and this commit provides the same also
for user defined build settings.
This allows reducing transition scalability issues,
by combining transitions with command line options:
a) Setting a limited number of common options via
transitions, which affects large parts of the
code base, but with limited number of variants.
b) When needed, *also* setting a few of many
specific options, each of them affecting only
their parts of the code base, but with many
variants.
Resolves #12731
Closes #13580.
PiperOrigin-RevId: 396689438
{Fast, Correct} - Choose two
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