tmux 3.0 - 3.2a doesn't fail when reading undefined options #59
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tmux 3.0 - 3.2a exits 0 even if variable was not found when using
show-options -gv, so the value being set to "" vs not being defined can't be detected via exit code for those versions.The workaround is to use a
show-options -gand grep for the option name. If it is found "" is accepted as intended value, otherwise the default is used.