I found some problems for tgif terminal.
1) The variable uActPointSize is set in TGIF_pointsize and
should save the pointsize. But it is not used.
2) The default point size of tgif terminal is larger than
other terminal (see test-tgif0.gif and test-post.gif). Especially
this disturbs the errorbar plot.
3) The function TGIF_arrow generates the native code of the
vector for tgif. But it may have some bug and is not more
useful than the default function do_arrow.
The patch tgif-point-1.diff included in the attach file may fix
snapshot of test output of tgif terminal before applying my patch.
snapshot of it after applying my patch.
snapshot of test output of post terminal
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