message: A tiny optimization to ImLineClosestPoint. Removed unnecessary sqrtf call.
  ab_lenSqr -> ab_len_sqr
  Moved line where ab_len_sqr is computed after the first return
diff: @@ -951,14 +951,13 @@ ImVec2 ImLineClosestPoint(const ImVec2& a, const ImVec2& b, const ImVec2& p)
  {
  ImVec2 ap = p - a;
  ImVec2 ab_dir = b - a;
  - float ab_len = sqrtf(ab_dir.x * ab_dir.x + ab_dir.y * ab_dir.y);
  - ab_dir *= 1.0f / ab_len;
  float dot = ap.x * ab_dir.x + ap.y * ab_dir.y;
  if (dot < 0.0f)
  return a;
  - if (dot > ab_len)
  + float ab_len_sqr = ab_dir.x * ab_dir.x + ab_dir.y * ab_dir.y;
  + if (dot > ab_len_sqr)
  return b;
  - return a + ab_dir * dot;
  + return a + ab_dir * dot / ab_len_sqr;
  }
  bool ImTriangleContainsPoint(const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& p)
  