Material color panel custom colors loss

[micheus]

Better now.

This is a dialog from the OS and we don't handle it except by filling the Custom palette with a gray-scale pattern (but, the system will handle it as soon as the user defines a new one).

When the previous color is present in one of those palette (System and Custom), then the proper color slot will be focused.
If it's not present, then the first color slot (top-left) will be focused and the slider (at right) will be pointing to that color setting. You can change the color and hit OK, but if you hit "Add to custom colors" then the first color slot in the custom palette will be overridden.

If you want to create your own custom color palette, you must first select a custom color slot and then chose the color on the color picker or slider and then hit "Add to custom colors".