Merge pull request #1320 from antonilol/regtest-1

regtest fixes

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

@@ -217,12 +217,8 @@ export class BlockComponent implements OnInit, OnDestroy {
       this.blockSubsidy = 0;
       return;
     }
-    this.blockSubsidy = 50;
-    let halvenings = Math.floor(this.block.height / 210000);
-    while (halvenings > 0) {
-      this.blockSubsidy = this.blockSubsidy / 2;
-      halvenings--;
-    }
+    const halvings = Math.floor(this.block.height / 210000);
+    this.blockSubsidy = 50 * 2 ** -halvings;
   }
 
   pageChange(page: number, target: HTMLElement) {

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

@@ -110,7 +110,7 @@ export class BlockchainBlocksComponent implements OnInit, OnDestroy {
     this.markBlockSubscription = this.stateService.markBlock$
       .subscribe((state) => {
         this.markHeight = undefined;
-        if (state.blockHeight) {
+        if (state.blockHeight !== undefined) {
           this.markHeight = state.blockHeight;
         }
         this.moveArrowToPosition(false);
@@ -127,7 +127,7 @@ export class BlockchainBlocksComponent implements OnInit, OnDestroy {
   }
 
   moveArrowToPosition(animate: boolean, newBlockFromLeft = false) {
-    if (!this.markHeight) {
+    if (this.markHeight === undefined) {
       this.arrowVisible = false;
       return;
     }

frontend/src/app/components/latest-blocks/latest-blocks.component.ts

@@ -109,8 +109,12 @@ export class LatestBlocksComponent implements OnInit, OnDestroy {
     if (this.isLoading) {
       return;
     }
+    const height = this.blocks[this.blocks.length - 1].height - 1;
+    if (height < 0) {
+      return;
+    }
     this.isLoading = true;
-    this.electrsApiService.listBlocks$(this.blocks[this.blocks.length - 1].height - 1)
+    this.electrsApiService.listBlocks$(height)
       .subscribe((blocks) => {
         this.blocks = this.blocks.concat(blocks);
         this.isLoading = false;