From f43d7ee9b17d8f4c8ecf0201d9a5561251c0ea09 Mon Sep 17 00:00:00 2001
From: David Figatner <david@yopeyopey.com>
Date: Sun, 2 Apr 2023 06:34:21 -0700
Subject: [PATCH] fix bug with negative heading resizing moving the viewport

---
 src/grid/sheet/GridOffsets.ts                    |  2 ++
 src/grid/sheet/GridOffsetsCache.ts               | 16 ++++++++++++++++
 src/gridGL/interaction/pointer/PointerHeading.ts |  4 ++--
 3 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/src/grid/sheet/GridOffsets.ts b/src/grid/sheet/GridOffsets.ts
index beb6401255..8e21b47b50 100644
--- a/src/grid/sheet/GridOffsets.ts
+++ b/src/grid/sheet/GridOffsets.ts
@@ -171,6 +171,7 @@ export class GridOffsets {
       } else {
         this.rows.set(change.row, { id: change.row, size: change.size });
       }
+      this.gridOffsetsCache.reset('row', change.row < 0);
     } else if (change.column !== undefined) {
       const entry = this.columns.get(change.column);
       if (entry) {
@@ -178,6 +179,7 @@ export class GridOffsets {
       } else {
         this.columns.set(change.column, { id: change.column, size: change.size });
       }
+      this.gridOffsetsCache.reset('column', change.column < 0);
     }
   }
 
diff --git a/src/grid/sheet/GridOffsetsCache.ts b/src/grid/sheet/GridOffsetsCache.ts
index 2abcce8f25..95e66b76d0 100644
--- a/src/grid/sheet/GridOffsetsCache.ts
+++ b/src/grid/sheet/GridOffsetsCache.ts
@@ -21,6 +21,22 @@ export class GridOffsetsCache {
     this.rowNegativeCache = [0];
   }
 
+  reset(direction: 'column' | 'row', negative: boolean) {
+    if (direction === 'column') {
+      if (negative) {
+        this.columnNegativeCache = [0];
+      } else {
+        this.columnCache = [0];
+      }
+    } else {
+      if (negative) {
+        this.rowNegativeCache = [0];
+      } else {
+        this.rowCache = [0];
+      }
+    }
+  }
+
   getColumnPlacement(column: number): { x: number; width: number } {
     let position = 0;
     if (column === 0) {
diff --git a/src/gridGL/interaction/pointer/PointerHeading.ts b/src/gridGL/interaction/pointer/PointerHeading.ts
index 7e19f3feb5..78a26f77c9 100644
--- a/src/gridGL/interaction/pointer/PointerHeading.ts
+++ b/src/gridGL/interaction/pointer/PointerHeading.ts
@@ -163,7 +163,7 @@ export class PointerHeading {
 
           // move viewport by the amount of the resize for negative columns
           const change = size - this.headingResizeViewport.originalSize;
-          this.app.viewport.x = this.headingResizeViewport.viewportStart + change;
+          this.app.viewport.x = this.headingResizeViewport.viewportStart + change * this.app.viewport.scale.x;
           this.headingResizeViewport.change = change;
         }
 
@@ -184,7 +184,7 @@ export class PointerHeading {
 
           // move viewport by the amount of the resize for negative columns
           const change = size - this.headingResizeViewport.originalSize;
-          this.app.viewport.y = this.headingResizeViewport.viewportStart + change;
+          this.app.viewport.y = this.headingResizeViewport.viewportStart + change * this.app.viewport.scale.x;
           this.headingResizeViewport.change = change;
         }