fix: include borders in style block size

style.go

@@ -268,6 +268,7 @@ func (s Style) Render(strs ...string) string {
 		leftPadding   = s.getAsInt(paddingLeftKey)
 
 		horizontalBorderSize = s.GetHorizontalBorderSize()
+		verticalBorderSize   = s.GetVerticalBorderSize()
 
 		colorWhitespace = s.getAsBool(colorWhitespaceKey, true)
 		inline          = s.getAsBool(inlineKey, false)
@@ -363,8 +364,9 @@ func (s Style) Render(strs ...string) string {
 		str = strings.ReplaceAll(str, "\n", "")
 	}
 
-	// Include borders in block width.
+	// Include borders in block size.
 	width -= horizontalBorderSize
+	height -= verticalBorderSize
 
 	// Word wrap
 	if !inline && width > 0 {

style_test.go

@@ -615,3 +615,28 @@ func TestWidth(t *testing.T) {
 		}
 	}
 }
+
+func TestHeight(t *testing.T) {
+	tests := []struct {
+		name  string
+		style Style
+	}{
+		{"height with borders", NewStyle().Width(80).Padding(0, 2).Border(NormalBorder(), true)},
+		{"height no borders", NewStyle().Width(80).Padding(0, 2)},
+		{"height unset borders", NewStyle().Width(80).Padding(0, 2).Border(NormalBorder(), true).BorderBottom(false).BorderTop(false)},
+		{"height single-sided border", NewStyle().Width(80).Padding(0, 2).Border(NormalBorder(), true).UnsetBorderLeft().UnsetBorderBottom().UnsetBorderRight()},
+	}
+	{
+		for _, tc := range tests {
+			t.Run(tc.name, func(t *testing.T) {
+				content := "The Romans learned from the Greeks that quinces slowly cooked with honey would “set” when cool. The Apicius gives a recipe for preserving whole quinces, stems and leaves attached, in a bath of honey diluted with defrutum: Roman marmalade. Preserves of quince and lemon appear (along with rose, apple, plum and pear) in the Book of ceremonies of the Byzantine Emperor Constantine VII Porphyrogennetos."
+				contentHeight := 20 - tc.style.GetVerticalFrameSize()
+				rendered := tc.style.Height(contentHeight).Render(content)
+				if Height(rendered) != contentHeight {
+					t.Log("\n" + rendered)
+					t.Fatalf("got: %d\n, want: %d", Height(rendered), contentHeight)
+				}
+			})
+		}
+	}
+}