Don't draw out of bounds line numbers

src/basic/math.cpp

@@ -125,6 +125,18 @@ Rect2 Shrink(Rect2 result, float v) {
     return result;
 }
 
+Rect2 ShrinkVertical(Rect2 result, float v) {
+    result.min.y += v;
+    result.max.y -= v;
+    return result;
+}
+
+Rect2 ShrinkHorizontal(Rect2 result, float v) {
+    result.min.x += v;
+    result.max.x -= v;
+    return result;
+}
+
 Vec2 GetMid(Rect2 r) {
     Vec2 size = GetSize(r);
     size.x /= 2.f;