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Bug introduced in 9.0 or earlier and persisting through 11.0.1 or later

I'm trying to understand this apparently incorrect Filling behavior in ListLinePlot[]. Evaluating this

Table[ListLinePlot[
 {{{-6.62, -25.469}, {-6.59, y}},{{-6.62, -25.55}, {-6.57, -25.7}}}, 
 PlotStyle -> Thickness[0.01], PlotRange -> {{-6.63, -6.52}, {-25.8, -25.4}},
 ImageSize -> 500, Filling -> {2 -> {{1}, {Green, Red}}}
], {y, {-25.68, -25.72}}]

produces this: enter image description here

The Filling option is supposed to be filling green above the orange line and red below it, but this is breaks when one slightly adjusts the y-value of the end point of blue line so that it is above the end point of the orange line.

This issue also exists in ListPlot[] using the Joined->True option. I'm using Mathematica 10.3.0.0.

I suspect this is related to the problem with needing to sort the data points for Filling to work. (Otherwise it fails silently, which is horrendously confusing for beginners.) However, in this case there are only two points for each line, and they are sorted. I haven't been able to figure out exactly what's going on, and what to do to avoid it. It may also be related to this apparent bug, but there doesn't seem to be any new points created.

EDIT: Here is a slightly more minimal example, thanks to george2079, confirming that this is not just another example of the ordering problem.

Table[ ListLinePlot[ 
 {{{0, 0}, {1, 1}}, {{.2, 0}, {.8, y}, {1, .5}}}, 
 Filling -> {2 -> {{1}, {Green, Red}}}
], {y, {.9, 1.1}}]

enter image description here

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  • $\begingroup$ Please do not add the bugs tag until your observations have been confirmed by other users. $\endgroup$ – J. M.'s torpor♦ Oct 16 '15 at 19:22
  • $\begingroup$ OK, got it. Sorry about that. $\endgroup$ – Jess Riedel Oct 16 '15 at 19:23
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    $\begingroup$ This may be relevant: 30145 $\endgroup$ – N.J.Evans Oct 16 '15 at 19:27
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    $\begingroup$ In your second case you have reversed the ordering of the lines (introducing the known sorting issue ) $\endgroup$ – george2079 Oct 16 '15 at 21:18
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    $\begingroup$ The first case is not ordering related. Here is another example Table[ ListLinePlot[ {{{0, 0}, {1, 1}}, {{.2, 0}, {.8, y}, {1, .5}}}, Filling -> {2 -> {{1}, {Green, Red}}}], {y, {.9, 1.1}}] $\endgroup$ – george2079 Oct 16 '15 at 21:41

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