Fix blockchain scroll jumping

frontend/src/app/components/blockchain/blockchain.component.html

@@ -1,5 +1,5 @@
 <div class="text-center" class="blockchain-wrapper" [class.time-ltr]="timeLtr" [class.ltr-transition]="ltrTransitionEnabled" #container>
-  <div class="position-container" [ngClass]="network ? network : ''" [style.--divider-offset]="dividerOffset + 'px'" [style.--mempool-offset]="mempoolOffset + 'px'">
+  <div #positionContainer class="position-container" [ngClass]="network ? network : ''" [style]="positionStyle">
     <span>
       <div class="blocks-wrapper">
         <div class="scroll-spacer" *ngIf="minScrollWidth" [style.left]="minScrollWidth + 'px'"></div>

frontend/src/app/components/blockchain/blockchain.component.scss

@@ -26,15 +26,7 @@
   position: absolute;
   left: 0;
   top: 75px;
-  --divider-offset: 50vw;
-  --mempool-offset: 0px;
-  transform: translateX(calc(var(--divider-offset) + var(--mempool-offset)));
-}
-
-.blockchain-wrapper.time-ltr {
-  .position-container {
-    transform: translateX(calc(100vw - var(--divider-offset) - var(--mempool-offset)));
-  }
+  transform: translateX(1280px);
 }
 
 .black-background {

frontend/src/app/components/blockchain/blockchain.component.ts

@@ -27,8 +27,11 @@ export class BlockchainComponent implements OnInit, OnDestroy, OnChanges {
   loadingTip: boolean = true;
   connected: boolean = true;
 
-  dividerOffset: number = 0;
-  mempoolOffset: number = 0;
+  dividerOffset: number | null = null;
+  mempoolOffset: number | null = null;
+  positionStyle = {
+    transform: "translateX(1280px)",
+  };
 
   constructor(
     public stateService: StateService,
@@ -40,6 +43,7 @@ export class BlockchainComponent implements OnInit, OnDestroy, OnChanges {
     this.network = this.stateService.network;
     this.timeLtrSubscription = this.stateService.timeLtr.subscribe((ltr) => {
       this.timeLtr = !!ltr;
+      this.updateStyle();
     });
     this.connectionStateSubscription = this.stateService.connectionState$.subscribe(state => {
       this.connected = (state === 2);
@@ -63,29 +67,47 @@ export class BlockchainComponent implements OnInit, OnDestroy, OnChanges {
     const prevOffset = this.mempoolOffset;
     this.mempoolOffset = 0;
     this.mempoolOffsetChange.emit(0);
+    this.updateStyle();
     setTimeout(() => {
       this.ltrTransitionEnabled = true;
       this.flipping = true;
       this.stateService.timeLtr.next(!this.timeLtr);
+      this.cd.markForCheck();
       setTimeout(() => {
         this.ltrTransitionEnabled = false;
         this.flipping = false;
         this.mempoolOffset = prevOffset;
-        this.mempoolOffsetChange.emit(this.mempoolOffset);
+        this.mempoolOffsetChange.emit((this.mempoolOffset || 0));
+        this.updateStyle();
+        this.cd.markForCheck();
       },  1000);
     }, 0);
-    this.cd.markForCheck();
   }
 
   onMempoolWidthChange(width): void {
     if (this.flipping) {
       return;
     }
-    this.mempoolOffset = Math.max(0, width - this.dividerOffset);
-    this.cd.markForCheck();
+    this.mempoolOffset = Math.max(0, width - (this.dividerOffset || 0));
+    this.updateStyle();
     this.mempoolOffsetChange.emit(this.mempoolOffset);
   }
 
+  updateStyle(): void {
+    if (this.dividerOffset == null || this.mempoolOffset == null) {
+      return;
+    }
+    const oldTransform = this.positionStyle.transform;
+    this.positionStyle = this.timeLtr ? {
+      transform: `translateX(calc(100vw - ${this.dividerOffset + this.mempoolOffset}px)`,
+    } : {
+      transform: `translateX(${this.dividerOffset + this.mempoolOffset}px)`,
+    };
+    if (oldTransform !== this.positionStyle.transform) {
+      this.cd.detectChanges();
+    }
+  }
+
   ngOnChanges(changes: SimpleChanges): void {
     if (changes.containerWidth) {
       this.onResize();
@@ -107,6 +129,6 @@ export class BlockchainComponent implements OnInit, OnDestroy, OnChanges {
         this.dividerOffset = width * 0.95;
       }
     }
-    this.cd.markForCheck();
+    this.updateStyle();
   }
 }