Polyline color not updated when hidden

[rahwang]

Reported in the forum: https://groups.google.com/forum/?hl=en#!topic/cesium-dev/Z0vcp_Fxs9o

When a polyline's color is modified while it is hidden, the color update is not applied. When the polyline is shown again, the color is the same as it was originally.

Here's a minimal Sandcastle example:
https://cesiumjs.org/Cesium/Apps/Sandcastle/index.html?src=Hello%20World.html&label=Showcases&gist=65b063743b1b18d718fdecd60dc134e9

Instructions to reproduce:

• Select "Hide line" from drop down
• Select "Color line", which should make line blue
• Select "Show line" and line appears but is red
• Select "Color line" again and line is still red
• Select "Show line" and then "Color line" and finally line turns blue

[mramato]

Thanks @rahwang! When writing up issues please include a full description of the bug and the exact steps to reproduce it as part of the description. The links provide more context, but everything a we need to reproduce should be in the issue itself.

[rahwang]

Gotcha @mramato ! Updated

[rahwang]

Came up in the forum again: https://groups.google.com/d/msg/cesium-dev/ZLxWrn_3joE/f8xClwppAwAJ

[hpinkos]

Duplicate #2909

[cesium-concierge]

Congratulations on closing the issue! I found these Cesium forum links in the comments above:

https://groups.google.com/forum/?hl=en#!topic/cesium-dev/Z0vcp_Fxs9o
https://groups.google.com/d/msg/cesium-dev/ZLxWrn_3joE/f8xClwppAwAJ

If this issue affects any of these threads, please post a comment like the following:

The issue at #5371 has just been closed and may resolve your issue. Look for the change in the next stable release of Cesium or get it now in the master branch on GitHub https://github.com/AnalyticalGraphicsInc/cesium.

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