Revize 6842a0b0

Re #8928 - Oprava chyb vzniklých v průběhu iterace

• change graphloader calling
• fix tooltip for negative values

src/vega/body/multilinechart.json

@@ -388 +388 @@
                       },
                       "y2": {
                         "scale": "yDetail",
-                        "value": 0
+                        "signal": "-1e+36"
                       },
                       "fill": {
                         "value": "#00ff00"
@@ -417 +417 @@
                       },
                       "y2": {
                         "scale": "yDetail",
-                        "value": 0
+                        "signal": "-1e+36"
                       },
                       "strokeOpacity": [
                         {