Fix Android group browser scrolling

main.go

@@ -5624,32 +5624,22 @@ func (u *ui) groupBar(gtx layout.Context) layout.Dimensions {
 			if atRoot {
 				u.phoneGroupBrowserExpanded = true
 			}
-			return layout.Flex{Axis: layout.Vertical}.Layout(gtx,
-				layout.Rigid(func(gtx layout.Context) layout.Dimensions {
-					if len(groups) == 0 {
-						return layout.Dimensions{}
-					}
-					maxY := gtx.Dp(unit.Dp(168))
-					if gtx.Constraints.Max.Y > maxY {
-						gtx.Constraints.Max.Y = maxY
-					}
-					if gtx.Constraints.Min.Y > gtx.Constraints.Max.Y {
-						gtx.Constraints.Min.Y = gtx.Constraints.Max.Y
-					}
-					return material.List(u.theme, &u.groupList).Layout(gtx, len(groups), func(gtx layout.Context, i int) layout.Dimensions {
-						idx := i
-						name := groups[i]
-						return layout.Inset{Bottom: unit.Dp(6)}.Layout(gtx, func(gtx layout.Context) layout.Dimensions {
-							for u.groupClicks[idx].Clicked(gtx) {
-								u.state.EnterGroup(name)
-								u.currentPath = append([]string(nil), u.state.CurrentPath...)
-								u.filter()
-							}
-							return tonedButton(gtx, u.theme, &u.groupClicks[idx], name)
-						})
+			children := make([]layout.FlexChild, 0, len(groups))
+			for i := range groups {
+				idx := i
+				name := groups[i]
+				children = append(children, layout.Rigid(func(gtx layout.Context) layout.Dimensions {
+					return layout.Inset{Bottom: unit.Dp(6)}.Layout(gtx, func(gtx layout.Context) layout.Dimensions {
+						for u.groupClicks[idx].Clicked(gtx) {
+							u.state.EnterGroup(name)
+							u.currentPath = append([]string(nil), u.state.CurrentPath...)
+							u.filter()
+						}
+						return tonedButton(gtx, u.theme, &u.groupClicks[idx], name)
 					})
-				}),
-			)
+				}))
+			}
+			return layout.Flex{Axis: layout.Vertical}.Layout(gtx, children...)
 		}
 		return layout.Flex{Axis: layout.Vertical}.Layout(gtx,
 			layout.Rigid(func(gtx layout.Context) layout.Dimensions {

main_test.go

@@ -775,6 +775,37 @@ func TestUIPhoneGroupBrowserToggleDoesNotChangeCurrentGroupToolsState(t *testing
 	}
 }
 
+func TestUIPhoneGroupBarDoesNotClampScrollableContentHeight(t *testing.T) {
+	t.Parallel()
+
+	u := newUIWithModel("phone", vault.Model{
+		Groups: [][]string{
+			{"Crew"},
+			{"Crew", "One"},
+			{"Crew", "Two"},
+			{"Crew", "Three"},
+			{"Crew", "Four"},
+			{"Crew", "Five"},
+			{"Crew", "Six"},
+			{"Crew", "Seven"},
+			{"Crew", "Eight"},
+		},
+	})
+	u.setCurrentPath([]string{"Crew"})
+
+	ops := new(op.Ops)
+	gtx := layout.Context{
+		Ops:         ops,
+		Constraints: layout.Exact(image.Pt(1080, 2400)),
+	}
+
+	dims := u.groupBar(gtx)
+	minOldCap := gtx.Dp(unit.Dp(220))
+	if dims.Size.Y <= minOldCap {
+		t.Fatalf("groupBar() phone height = %d, want > %d to avoid nested-scroll clamp", dims.Size.Y, minOldCap)
+	}
+}
+
 func TestUIPhoneStartsWithGroupToolsCollapsed(t *testing.T) {
 	t.Parallel()