initviz: fix chart overflow artifacts in filled charts

Set line width to 0 before filling charts to prevent the stroke
from extending beyond the intended fill area, eliminating visual
artifacts at chart boundaries.

Adapted from xrmx/bootchart#42 (PATCH 008/182)

Signed-off-by: Joachim Wiberg <[email protected]>

Author: troglobit

initviz/draw.py

@@ -263,6 +263,7 @@ def transform_point_coords(point, x_base, y_base, \
 					       chart_bounds[0], chart_bounds[1])
 		ctx.line_to(x, y)
 	if fill:
+		ctx.set_line_width(0.0)
 		ctx.stroke_preserve()
 		ctx.line_to(last[0], chart_bounds[1]+chart_bounds[3])
 		ctx.line_to(first[0], chart_bounds[1]+chart_bounds[3])