From b5bf346229fcd0d8900e30eabd4fa4ca4a28e9a7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Arno=C5=A1t=20Pleskot?= <arnostpleskot@gmail.com>
Date: Fri, 9 Feb 2024 16:10:58 +0100
Subject: [PATCH] fix: prevent jumping when trying to zoom out the zoomFactor

---
 packages/excalidraw/scene/scrollConstraints.ts | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/packages/excalidraw/scene/scrollConstraints.ts b/packages/excalidraw/scene/scrollConstraints.ts
index ea6242de09..32791d7ee7 100644
--- a/packages/excalidraw/scene/scrollConstraints.ts
+++ b/packages/excalidraw/scene/scrollConstraints.ts
@@ -401,11 +401,17 @@ export const constrainScrollState = (
         allowOverscroll,
       });
 
-  const constrainedValues = constrainScrollValues({
-    ...constraints,
-    scrollX,
-    scrollY,
-  });
+  const constrainedValues =
+    zoom.value >= constraints.constrainedZoom.value // when trying to zoom out of the constrained area we want to keep the viewport centered and prevent jumping caused by change of scrollX and scrollY values when zooming
+      ? constrainScrollValues({
+          ...constraints,
+          scrollX,
+          scrollY,
+        })
+      : calculateConstrainedScrollCenter(state, {
+          scrollX,
+          scrollY,
+        });
 
   if (!canUseMemoizedValues) {
     memoizedValues = {