Redmine

Raphael.js had a color-selection method called getColor(), and revision graph colors were determined by that method.
0001-Replace-library-dependent-SVG-rendering-with-a-nativ.patch changes the color-selection logic, so the exact colors may differ slightly, but color distinguishability should remain sufficient.

Before change	After change

In Redmine, Raphael.js was added in 2011. At that time, it was used to show revision graphs in the repository browser (#5501). Later, in 2013, it was also used to draw the progress line (#12122) and issue relations (#3436) in the Gantt chart.

At that time, Redmine needed to support older versions of Internet Explorer, such as IE8, which did not support SVG. Raphael.js worked across different browsers by using SVG in modern browsers and VML in older versions of Internet Explorer, so it was a reasonable choice.

Today, there is no longer a need to support Internet Explorer. Modern browsers provide consistent native support for SVG, so the compatibility-related need for Raphael.js is now very small.