prevent historical graph zoom state from resetting during data updates

assets/js/plugins.js

@@ -26,3 +26,27 @@ export function uPlotTooltipPlugin (onHover) {
     }
   }
 }
+
+export function uPlotIsZoomedPlugin (onZoomIn, onZoomOut) {
+  return {
+    hooks: {
+      setSelect: u => {
+        u._zoomPluginIgnoreNextSetScale = true
+
+        if (onZoomIn) {
+          onZoomIn(u)
+        }
+      },
+      setScale: u => {
+        if (typeof u._zoomPluginIgnoreNextSetScale !== 'boolean') {
+          return
+        }
+        if (u._zoomPluginIgnoreNextSetScale) {
+          u._zoomPluginIgnoreNextSetScale = false
+        } else if (onZoomOut) {
+          onZoomOut(u)
+        }
+      }
+    }
+  }
+}