Link with adjusting=End doesn't recompute route correctly on group collapse when sibling links exist

[walter]

GoJS 3.1.9 released

Changes for 3.1.9 In Table Panel, fixed measuring of stretched GraphObjects that span multiple rows or columns so that they correctly account for space used by other rows or columns. Fixed routing of multiple links connected with …Side Spot ports when some have non-None Link.adjusting. Improved routing of orthogonal links and routing of no-Spot links when ports overlap, fixing regressions since 3.1.0.