From 3a8f6f5aa505396d7486eb8ef9c7743d4732222a Mon Sep 17 00:00:00 2001
From: tydude001 <tylergrose321@gmail.com>
Date: Sun, 11 Oct 2026 19:04:55 -0500
Subject: [PATCH] AutoFilter: the value list scrolls across the menu's full
 width (Fixes #432)

The value list kept egui's default auto_shrink, so its scroll bar sat mid-menu after the longest
value and the wheel only scrolled it with the pointer over a value. Keep the height shrinking but
not the width: the scroll bar is at the menu's right edge and the wheel works anywhere over the list.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/ui-egui/src/grid.rs                 |  4 +-
 crates/ui-egui/tests/filter_list_scroll.rs | 61 ++++++++++++++++++++++
 2 files changed, 64 insertions(+), 1 deletion(-)
 create mode 100644 crates/ui-egui/tests/filter_list_scroll.rs

diff --git a/crates/ui-egui/src/grid.rs b/crates/ui-egui/src/grid.rs
index d0eef85..aaf6885 100644
--- a/crates/ui-egui/src/grid.rs
+++ b/crates/ui-egui/src/grid.rs
@@ -2547,7 +2547,9 @@ fn filter_menu(app: &mut SheetApp, ui: &mut egui::Ui, geo: &Geo, was_open: bool)
                     c.1 = all_new;
                 }
             }
-            egui::ScrollArea::vertical().max_height(220.0).show(ui, |ui| {
+            // Full width: shrunk to the longest value, the scroll bar sat mid-menu and the wheel only
+            // worked over the values themselves (#432).
+            egui::ScrollArea::vertical().max_height(220.0).auto_shrink([false, true]).show(ui, |ui| {
                 for (v, on) in checks.iter_mut().filter(|(v, _)| matches(v)) {
                     ui.checkbox(on, v.as_str());
                 }
diff --git a/crates/ui-egui/tests/filter_list_scroll.rs b/crates/ui-egui/tests/filter_list_scroll.rs
new file mode 100644
index 0000000..35406fa
--- /dev/null
+++ b/crates/ui-egui/tests/filter_list_scroll.rs
@@ -0,0 +1,61 @@
+//! The AutoFilter value list scrolls with the pointer anywhere over it, not only over the values
+//! themselves (issue #432): the list takes the menu's full width, so its scroll bar and wheel area do too.
+
+use egui::{Event, Modifiers, MouseWheelUnit, PointerButton, TouchPhase, pos2, vec2};
+use egui_kittest::kittest::Queryable;
+use gridcraft_engine::Session;
+use gridcraft_engine::core::CellRef;
+use gridcraft_ui_egui::{SheetApp, grid};
+use serde_json::json;
+
+type Harness = egui_kittest::Harness<'static, SheetApp>;
+
+/// A1:A81 holds a header and 80 distinct values, with the AutoFilter's menu open on column A.
+fn filter_menu_on_a_long_list() -> Harness {
+    let mut session = Session::new();
+    session.new_workbook();
+    let mut values = vec![vec![json!("Code")]];
+    values.extend((1..=80).map(|i| vec![json!(format!("ITEM-{i:03}"))]));
+    session.execute("range.setValues", json!({"range": "A1", "values": values})).unwrap();
+    session.execute("data.filter", json!({"range": "A1:A81"})).unwrap();
+    let mut h = egui_kittest::Harness::builder().with_size(egui::vec2(1200.0, 800.0)).build_ui_state(
+        |ui, app: &mut SheetApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        SheetApp::new(session, Default::default()),
+    );
+    h.run_steps(4);
+    let button = {
+        let app = h.state();
+        let sh = app.session.active().unwrap().wb.active().unwrap();
+        let geo = grid::Geo::new(sh, app.grid.rect.unwrap(), app.view().scroll);
+        grid::filter_button_rect(&geo, sh, CellRef::parse("A1").unwrap()).center()
+    };
+    h.input_mut().events.push(Event::PointerMoved(button));
+    for pressed in [true, false] {
+        h.input_mut().events.push(Event::PointerButton { pos: button, button: PointerButton::Primary, pressed, modifiers: Modifiers::NONE });
+    }
+    h.run_steps(4);
+    assert!(h.state().grid.filter_menu.is_some(), "the filter menu opens");
+    h
+}
+
+#[test]
+fn filter_list_scrolls_with_the_pointer_right_of_the_values() {
+    let mut h = filter_menu_on_a_long_list();
+    let first = h.get_by_label("ITEM-001").rect();
+    // The menu is 230 points wide; the value labels end well before this point.
+    let pointer = pos2(first.left() + 200.0, first.center().y);
+    h.input_mut().events.push(Event::PointerMoved(pointer));
+    h.run_steps(2);
+    h.input_mut().events.push(Event::MouseWheel {
+        unit: MouseWheelUnit::Line,
+        delta: vec2(0.0, -3.0),
+        phase: TouchPhase::Move,
+        modifiers: Modifiers::NONE,
+    });
+    h.run_steps(20);
+    let now = h.query_by_label("ITEM-001").map(|n| n.rect().top());
+    assert!(now.is_none_or(|y| y < first.top() - 20.0), "the wheel scrolls the list: ITEM-001 was at {}, now {now:?}", first.top());
+}