From 9159fc68e163f902f9993d6c8bf97a39d39cf1e8 Mon Sep 17 00:00:00 2001
From: Daniel Imms <2193314+Tyriar@users.noreply.github.com>
Date: Mon, 25 Jul 2022 09:44:54 -0700
Subject: [PATCH] Redraw canvas renderer selection on resize

Fixes #1963
---
 src/browser/renderer/BaseRenderLayer.ts      | 6 +++---
 src/browser/renderer/SelectionRenderLayer.ts | 7 +++++--
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/src/browser/renderer/BaseRenderLayer.ts b/src/browser/renderer/BaseRenderLayer.ts
index 0a9b8057..a44253a0 100644
--- a/src/browser/renderer/BaseRenderLayer.ts
+++ b/src/browser/renderer/BaseRenderLayer.ts
@@ -29,9 +29,9 @@ export abstract class BaseRenderLayer implements IRenderLayer {
   private _scaledCharLeft: number = 0;
   private _scaledCharTop: number = 0;
 
-  private _selectionStart: [number, number] | undefined;
-  private _selectionEnd: [number, number] | undefined;
-  private _columnSelectMode: boolean = false;
+  protected _selectionStart: [number, number] | undefined;
+  protected _selectionEnd: [number, number] | undefined;
+  protected _columnSelectMode: boolean = false;
 
   protected _charAtlas: BaseCharAtlas | undefined;
 
diff --git a/src/browser/renderer/SelectionRenderLayer.ts b/src/browser/renderer/SelectionRenderLayer.ts
index ce4fe071..f8bdc234 100644
--- a/src/browser/renderer/SelectionRenderLayer.ts
+++ b/src/browser/renderer/SelectionRenderLayer.ts
@@ -42,8 +42,11 @@ export class SelectionRenderLayer extends BaseRenderLayer {
 
   public resize(dim: IRenderDimensions): void {
     super.resize(dim);
-    // Resizing the canvas discards the contents of the canvas so clear state
-    this._clearState();
+    // On resize use the base render layer's cached selection values since resize clears _state
+    // inside reset.
+    if (this._selectionStart && this._selectionEnd) {
+      this.onSelectionChanged(this._selectionStart, this._selectionEnd, this._columnSelectMode);
+    }
   }
 
   public reset(): void {