From 7d4afc15d3a3996cc0ccccc170535ec635bccd3c Mon Sep 17 00:00:00 2001
From: dom <githubaccount56556@proton.me>
Date: Wed, 22 Jul 2026 14:25:52 +0800
Subject: [PATCH] opt fab anim

Signed-off-by: dom <githubaccount56556@proton.me>
---
 lib/scripts/patch.ps1             |  4 +++-
 lib/scripts/scroll_position.patch | 17 +++++++++++++++++
 pubspec.lock                      |  2 +-
 3 files changed, 21 insertions(+), 2 deletions(-)
 create mode 100644 lib/scripts/scroll_position.patch

diff --git a/lib/scripts/patch.ps1 b/lib/scripts/patch.ps1
index 8afdfa5e3..0dd44b613 100644
--- a/lib/scripts/patch.ps1
+++ b/lib/scripts/patch.ps1
@@ -43,6 +43,8 @@ $EditableTextPatch = "lib/scripts/editable_text.patch"
 
 $TextFieldPatch = "lib/scripts/text_field.patch"
 
+$ScrollPositionPatch = "lib/scripts/scroll_position.patch"
+
 # TODO: remove
 # https://github.com/flutter/flutter/pull/183261
 $SelectableRegionPatch = "lib/scripts/null_safety_for_selectable_region.patch"
@@ -75,7 +77,7 @@ $reverts = @()
 $patches = @($ModalBarrierPatch, $TextSelectionPatch, $MouseCursorPatch,
             $ImageAnimPatch, $LayoutBuilderPatch, $NavigationDrawerPatch,
             $PopupMenuPatch, $FABPatch, $SelectableRegionPatch, $SelectableRegionSelectionPatch,
-            $EditableTextPatch, $TextFieldPatch)
+            $EditableTextPatch, $TextFieldPatch, $ScrollPositionPatch)
 
 switch ($platform.ToLower()) {
     "android" {
diff --git a/lib/scripts/scroll_position.patch b/lib/scripts/scroll_position.patch
new file mode 100644
index 000000000..ab2a34d1a
--- /dev/null
+++ b/lib/scripts/scroll_position.patch
@@ -0,0 +1,17 @@
+diff --git a/packages/flutter/lib/src/widgets/scroll_position_with_single_context.dart b/packages/flutter/lib/src/widgets/scroll_position_with_single_context.dart
+index 96d77f67008..533fa0eecaf 100644
+--- a/packages/flutter/lib/src/widgets/scroll_position_with_single_context.dart
++++ b/packages/flutter/lib/src/widgets/scroll_position_with_single_context.dart
+@@ -127,8 +127,10 @@ class ScrollPositionWithSingleContext extends ScrollPosition implements ScrollAc
+ 
+   @override
+   void applyUserOffset(double delta) {
+-    updateUserScrollDirection(delta > 0.0 ? ScrollDirection.forward : ScrollDirection.reverse);
+-    setPixels(pixels - physics.applyPhysicsToUserOffset(this, delta));
++    final newPixels = pixels - physics.applyPhysicsToUserOffset(this, delta);
++    if (newPixels != setPixels(newPixels) || _userScrollDirection == ScrollDirection.idle) {
++      updateUserScrollDirection(delta > 0.0 ? ScrollDirection.forward : ScrollDirection.reverse);
++    }
+   }
+ 
+   @override
diff --git a/pubspec.lock b/pubspec.lock
index 3151ee9fe..1a45d520c 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -477,7 +477,7 @@ packages:
     description:
       path: "."
       ref: dev
-      resolved-ref: "7cd9461210185bd9e67368b8081195384dc8b919"
+      resolved-ref: de88c222852c33b3203b868794ac45734c8bcec2
       url: "https://github.com/bggRGjQaUbCoE/extended_nested_scroll_view.git"
     source: git
     version: "6.2.1"