Fix: Improvements to avoid distortions in sankey diagram links loops #7272
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… Issue #7132
I tried to avoid distortion when the source and target of a link were moved. In the first place, I found a condition ("isSourceBeforeTarget") to use to know if a target block is before the source block or not, I used this condition to draw the path in two different ways. I used another condition ("isPathOverlapped") to improve the draw of the path when the two blocks are so close to having almost the whole path overlapped, this avoids, in part, some distortions and defines another way to draw the path in this particular condition. All the changes are done in the section of the path which is dedicated to drawing the arc both inner and outer