Backport request for 6.0.4 release version

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Dear Ethan,

I would like to request a backport to the 6.0.4 release.

I have observed differences in polygon color rendering between the
development version and previous release versions (including
6.0.4-testing). The development version renders polygons with the intended
colors, while the release versions render them with different colors.

The following script demonstrates the issue:
```
set xrange [-2:2]
set yrange [-2:2]
set zrange [-2:2]

$contour <<EOD
-1 -1 0
-1  1 0
 1  1 0
 1 -1 0
-1 -1 0
EOD

set style line 3 lc "#d000ff00"
set key noautotitle
set isotropic
set xyplane 0
set view ,,1.6


set multiplot layout 2,2

  # plot 1 : filled in "Red" with "Blue" border
  set title "Plot 1"
  splot $contour using 1:2:3 with polygons fillstyle border lc "blue" fc
rgb "red"

  # plot 2 : filled in pallete color with default border
  set title "Plot 2"
  splot $contour using 1:2:3 with polygons fillstyle fc palette

  # plot 3 : filled in transparent default color with "Black" border
  set title "Plot 3"
  splot $contour using 1:2:3 with polygons fillstyle transparent border lc
black

  # plot 4 : filled in transparent "Green" color with default border
  set title "Plot 4"
  splot $contour using 1:2:3 with polygons ls 3

unset multiplot

pause -1
```

If the fix for this issue in the development version is sufficiently
stable, I would greatly appreciate its backport to the 6.0.4 release, even
if only for some of the cases rather than all of them.

Thank you for your consideration.

Best regards,
H. Motoyoshi

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<div dir=3D"ltr"><p class=3D"gmail-font-claude-response-body gmail-break-wo=
rds gmail-whitespace-normal" style=3D"color:rgb(0,0,0);font-family:Helvetic=
a;font-size:12px">Dear Ethan,</p><p class=3D"gmail-font-claude-response-bod=
y gmail-break-words gmail-whitespace-normal" style=3D"color:rgb(0,0,0);font=
-family:Helvetica;font-size:12px">I would like to request a backport to the=
 6.0.4 release.</p><p class=3D"gmail-font-claude-response-body gmail-break-=
words gmail-whitespace-normal" style=3D"color:rgb(0,0,0);font-family:Helvet=
ica;font-size:12px">I have observed differences in polygon color rendering =
between the development version and previous release versions (including 6.=
0.4-testing). The development version renders polygons with the intended co=
lors, while the release versions render them with different colors.</p><p c=
lass=3D"gmail-font-claude-response-body gmail-break-words gmail-whitespace-=
normal" style=3D"color:rgb(0,0,0);font-family:Helvetica;font-size:12px">The=
 following script demonstrates the issue:</p><div class=3D"gmail-AppleOrigi=
nalContents" style=3D"color:rgb(0,0,0);font-family:Helvetica;font-size:12px=
;direction:ltr">```</div><div class=3D"gmail-AppleOriginalContents" style=
=3D"color:rgb(0,0,0);font-family:Helvetica;font-size:12px;direction:ltr"><d=
iv class=3D"gmail-AppleOriginalContents" style=3D"direction:ltr">set xrange=
 [-2:2]</div><div class=3D"gmail-AppleOriginalContents" style=3D"direction:=
ltr">set yrange [-2:2]</div><div class=3D"gmail-AppleOriginalContents" styl=
e=3D"direction:ltr">set zrange [-2:2]</div><div class=3D"gmail-AppleOrigina=
lContents" style=3D"direction:ltr"><br></div><div class=3D"gmail-AppleOrigi=
nalContents" style=3D"direction:ltr">$contour &lt;&lt;EOD</div><div class=
=3D"gmail-AppleOriginalContents" style=3D"direction:ltr">-1 -1 0</div><div =
class=3D"gmail-AppleOriginalContents" style=3D"direction:ltr">-1 =C2=A01 0<=
/div><div class=3D"gmail-AppleOriginalContents" style=3D"direction:ltr">=C2=
=A01 =C2=A01 0</div><div class=3D"gmail-AppleOriginalContents" style=3D"dir=
ection:ltr">=C2=A01 -1 0</div><div class=3D"gmail-AppleOriginalContents" st=
yle=3D"direction:ltr">-1 -1 0</div><div class=3D"gmail-AppleOriginalContent=
s" style=3D"direction:ltr">EOD</div><div class=3D"gmail-AppleOriginalConten=
ts" style=3D"direction:ltr"><br></div><div class=3D"gmail-AppleOriginalCont=
ents" style=3D"direction:ltr">set style line 3 lc &quot;#d000ff00&quot;</di=
v><div class=3D"gmail-AppleOriginalContents" style=3D"direction:ltr">set ke=
y noautotitle</div><div class=3D"gmail-AppleOriginalContents" style=3D"dire=
ction:ltr">set isotropic</div><div class=3D"gmail-AppleOriginalContents" st=
yle=3D"direction:ltr">set xyplane 0</div><div class=3D"gmail-AppleOriginalC=
ontents" style=3D"direction:ltr">set view ,,1.6</div><div class=3D"gmail-Ap=
pleOriginalContents" style=3D"direction:ltr"><br></div><div class=3D"gmail-=
AppleOriginalContents" style=3D"direction:ltr"><br></div><div class=3D"gmai=
l-AppleOriginalContents" style=3D"direction:ltr">set multiplot layout 2,2</=
div><div class=3D"gmail-AppleOriginalContents" style=3D"direction:ltr"><br>=
</div><div class=3D"gmail-AppleOriginalContents" style=3D"direction:ltr">=
=C2=A0 # plot 1 : filled in &quot;Red&quot; with &quot;Blue&quot; border</d=
iv><div class=3D"gmail-AppleOriginalContents" style=3D"direction:ltr">=C2=
=A0 set title &quot;Plot 1&quot;</div><div class=3D"gmail-AppleOriginalCont=
ents" style=3D"direction:ltr">=C2=A0 splot $contour using 1:2:3 with polygo=
ns fillstyle border lc &quot;blue&quot; fc rgb &quot;red&quot;=C2=A0</div><=
div class=3D"gmail-AppleOriginalContents" style=3D"direction:ltr">=C2=A0=C2=
=A0</div><div class=3D"gmail-AppleOriginalContents" style=3D"direction:ltr"=
>=C2=A0 # plot 2 : filled in pallete color with default border</div><div cl=
ass=3D"gmail-AppleOriginalContents" style=3D"direction:ltr">=C2=A0 set titl=
e &quot;Plot 2&quot;</div><div class=3D"gmail-AppleOriginalContents" style=
=3D"direction:ltr">=C2=A0 splot $contour using 1:2:3 with polygons fillstyl=
e fc palette=C2=A0</div><div class=3D"gmail-AppleOriginalContents" style=3D=
"direction:ltr">=C2=A0=C2=A0</div><div class=3D"gmail-AppleOriginalContents=
" style=3D"direction:ltr">=C2=A0 # plot 3 : filled in transparent default c=
olor with &quot;Black&quot; border</div><div class=3D"gmail-AppleOriginalCo=
ntents" style=3D"direction:ltr">=C2=A0 set title &quot;Plot 3&quot;</div><d=
iv class=3D"gmail-AppleOriginalContents" style=3D"direction:ltr">=C2=A0 spl=
ot $contour using 1:2:3 with polygons fillstyle transparent border lc black=
 =C2=A0</div><div class=3D"gmail-AppleOriginalContents" style=3D"direction:=
ltr">=C2=A0=C2=A0</div><div class=3D"gmail-AppleOriginalContents" style=3D"=
direction:ltr">=C2=A0 # plot 4 : filled in transparent &quot;Green&quot; co=
lor with default border</div><div class=3D"gmail-AppleOriginalContents" sty=
le=3D"direction:ltr">=C2=A0 set title &quot;Plot 4&quot;</div><div class=3D=
"gmail-AppleOriginalContents" style=3D"direction:ltr">=C2=A0 splot $contour=
 using 1:2:3 with polygons ls 3 =C2=A0</div><div class=3D"gmail-AppleOrigin=
alContents" style=3D"direction:ltr"><br></div><div class=3D"gmail-AppleOrig=
inalContents" style=3D"direction:ltr">unset multiplot</div><div class=3D"gm=
ail-AppleOriginalContents" style=3D"direction:ltr"><br></div><div class=3D"=
gmail-AppleOriginalContents" style=3D"direction:ltr">pause -1</div></div><d=
iv class=3D"gmail-AppleOriginalContents" style=3D"color:rgb(0,0,0);font-fam=
ily:Helvetica;font-size:12px;direction:ltr">```</div><div class=3D"gmail-Ap=
pleOriginalContents" style=3D"color:rgb(0,0,0);font-family:Helvetica;font-s=
ize:12px;direction:ltr"><br></div><div class=3D"gmail-AppleOriginalContents=
" style=3D"color:rgb(0,0,0);font-family:Helvetica;font-size:12px;direction:=
ltr"><div class=3D"gmail-AppleOriginalContents" style=3D"direction:ltr">If =
the fix for this issue in the development version is sufficiently stable, I=
 would greatly appreciate its backport to the 6.0.4 release, even if only f=
or some of the cases rather than all of them.</div><div class=3D"gmail-Appl=
eOriginalContents" style=3D"direction:ltr"><br></div><div class=3D"gmail-Ap=
pleOriginalContents" style=3D"direction:ltr">Thank you for your considerati=
on.</div><div class=3D"gmail-AppleOriginalContents" style=3D"direction:ltr"=
><br></div><div class=3D"gmail-AppleOriginalContents" style=3D"direction:lt=
r">Best regards,</div><div class=3D"gmail-AppleOriginalContents" style=3D"d=
irection:ltr">H. Motoyoshi</div></div></div>

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