When use line_smooth, if it's a oblique line and make the wide bigger you will find the line_smooth is effect in the middle of the line but in the end of line it's like a line not use line_smooth, but if we use the swrast the line is look good.
Can you attach the source for application to demonstrate the problem, or even better create a piglit test [1]. [1] https://cgit.freedesktop.org/piglit
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