handle uneven disribution of space

ui/ui_test.go

@@ -55,6 +55,32 @@ func TestContainerTwoBoxesHStack(t *testing.T) {
 		t.Fail()
 	}
 }
+func TestContainerThreeBoxesUnevenHStack(t *testing.T) {
+	expect := `┌─ one ──┐┌─ two ──┐┌─ three 
+│        ││        ││       │
+│        ││        ││       │
+│        ││        ││       │
+└────────┘└────────┘└───────┘
+`
+	m := &MockScreen{}
+	one := NewBox("one", nil, Contents{})
+	two := NewBox("two", nil, Contents{})
+	three := NewBox("three", nil, Contents{})
+	container := NewContainer(
+		Contents{{Container: one}, {Container: two}, {Container: three}},
+		LayoutHorizontalEven,
+	)
+	m.Init()
+	m.Resize(0, 0, 5, 29)
+	container.SetSize(0, 0, 5, 29)
+	container.Draw(m)
+	result := m.DumpContents()
+	if result != expect {
+		fmt.Printf("expected:\n%+v", expect)
+		fmt.Printf("actual:\n%+v", result)
+		t.Fail()
+	}
+}
 
 func TestContainerTwoBoxesVStack(t *testing.T) {
 	expect := `┌─ one ──┐