fix cal_heatmap tips location error (#5480) (#5587)
fix cal_heatmap tips location error (#5480) (#5587)

* fix cal_heatmap tips location error

* fix graph-legend

zhouyao1994/incubator-superset,mistercrunch/panoramix,apache/incubator-superset,airbnb/superset,mistercrunch/panoramix,airbnb/caravel,apache/incubator-superset,mistercrunch/panoramix,zhouyao1994/incubator-superset,airbnb/superset,mistercrunch/panoramix,airbnb/caravel,airbnb/caravel,apache/incubator-superset,zhouyao1994/incubator-superset,airbnb/superset,airbnb/caravel,zhouyao1994/incubator-superset,airbnb/superset,apache/incubator-superset,apache/incubator-superset,zhouyao1994/incubator-superset