Fix gradient fill artifacts by removing overlapping segment ranges #1
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Problem
When using LineDataSet with setDrawFilled(true) and a gradient drawable, visible vertical seams appear between filled segments.
This happens because drawLinearFill() artificially expands the drawing range (startIndex - 1 / endIndex + 1) for drawable fills, which causes overlapping filled paths. Gradient drawables render alpha blending differently on overlapping areas, resulting in visible artifacts.
Solution
The fix removes the artificial range expansion and renders each filled segment strictly within its own index range.