description:
"auto" for curve fitting line is not black but transparent.

build number:
2.6.0.v20100602-0949

steps to reproduce:
1. new a chart, in format chart->series->value (y) series, tick "shown curve fitting line", click "curve fitting line" button.
2. select "auto" for color.

expected result:
the line is shown with color black.

actual result:
the line disappears.

error log:
n/a
this is not a bug. we only apply style for axis line or series line for performance consideration. so all other line color will be null if it's set to "auto". lines with null color will not be drawn in rendering. so set to wontfix.
need ui change for this.
fixed. only show auto button for series line color or axis line color.
verified in build (2.6.1.v20100617-0630), closed.