massive Shape rework: keep both tvPoints/Props and ourPoints/Props; delegate model updates to subclasses; DCA/VLine working but Ladder/HLine not done.

src/charts/chart.js

@@ -1,6 +1,7 @@
 import {useChartOrderStore} from "@/orderbuild.js";
 import {invokeCallbacks, prototype} from "@/common.js";
 import {DataFeed, initFeeDropdown, lookupSymbol} from "@/charts/datafeed.js";
+import {intervalToSeconds} from "@/misc.js";
 
 export let widget = null
 export let chart = null
@@ -24,6 +25,11 @@ function changeSymbol(symbol) {
 }
 
 
+function changeInterval(interval, _timeframe) {
+    useChartOrderStore().intervalSecs = intervalToSeconds(interval)
+}
+
+
 /*  TradingView event keystrings
 const subscribeEvents = [
     'toggle_sidebar', 'indicators_dialog', 'toggle_header', 'edit_object_dialog', 'chart_load_requested',
@@ -69,8 +75,10 @@ function initChart() {
     console.log('init chart')
     chart = widget.activeChart()
     chart.crossHairMoved().subscribe(null, (point)=>setTimeout(()=>handleCrosshairMovement(point),0) )
-    chart.onSymbolChanged().subscribe(null, changeSymbol);
+    chart.onSymbolChanged().subscribe(null, changeSymbol)
+    chart.onIntervalChanged().subscribe(null, changeInterval)
     changeSymbol(chart.symbolExt())
+    changeInterval(widget.symbolInterval().interval)
     useChartOrderStore().chartReady = true
     console.log('chart ready')
 }
@@ -242,7 +250,6 @@ function drawingEventWorker() {
         const queue = drawingEventQueue
         drawingEventQueue = []
         propsEvents = {}
-        // console.log('events locked', queue)
         for (const [id, event] of queue) {
             if (event === 'properties_changed')
                 propsEvents[id] = event
@@ -259,8 +266,18 @@ function drawingEventWorker() {
 }
 
 function doHandleDrawingEvent(id, event) {
-    // console.log('drawing event', id, event)
-    const shape = event === 'remove' ? null : chart.getShapeById(id);
+    console.log('drawing event', id, event)
+    let shape
+    if (event==='remove')
+        shape = null
+    else {
+        try {
+            shape = chart.getShapeById(id)
+        }
+        catch {
+            return
+        }
+    }
     if (event === 'create') {
         const co = useChartOrderStore();
         const callbacks = co.drawingCallbacks