datafeed fixes; line drawing fix

src/charts/chart-misc.js

@@ -1,4 +1,5 @@
 import {useChartOrderStore} from "@/orderbuild.js";
+import {unique} from "@/misc.js";
 
 
 // Sunday January 4th, 2009 just before Bitcoin Genesis
@@ -22,3 +23,39 @@ export function pointsToTvOhlcStart(points, periodSeconds=null) {
         return {time: nearestOhlcStart(p.time, periodSeconds), price: p.price}
     })
 }
+
+export function dirtyPoints(pointsA, pointsB) {
+    if (pointsA === undefined)
+        return true
+    if (pointsB === undefined)
+        return false
+    if (pointsB === null)
+        return pointsA !== null
+    if (pointsA === null)
+        return pointsB.length > 0
+    if (pointsA.length !== pointsB.length)
+        return true
+    for (const i in pointsA) {
+        const a = pointsA[i]
+        const b = pointsB[i]
+        if (a === null && b !== null || a !== null && b === null ||
+            a.time !== b.time || a.price !== b.price)
+            return true
+    }
+    return false
+} // B is modifying A
+function dirtyKeys(propsA, propsB) {
+    if (propsB === null)
+        return propsA === null ? [] : [...Object.keys(propsA)]
+    if (propsA === null)
+        return [...Object.keys(propsB)]
+    const keys = unique([...Object.keys(propsA), ...Object.keys(propsB)])
+    return keys.filter((k) => propsB[k] !== undefined && (!(k in propsA) || propsA[k] !== propsB[k]))
+}
+
+export function dirtyItems(a, b) {
+    const result = {}
+    for (const k of dirtyKeys(a, b))
+        result[k] = b[k]
+    return result
+}