message: Begin: Shallow tweak to minimize diff with nav branch
diff: @@ -4448,6 +4448,12 @@ bool ImGui::Begin(const char* name, bool* p_open, const ImVec2& size_on_first_us
  // Title bar
  if (!(flags & ImGuiWindowFlags_NoTitleBar))
  {
  + // Collapse button
  + if (!(flags & ImGuiWindowFlags_NoCollapse))
  + {
  + RenderCollapseTriangle(window->Pos + style.FramePadding, !window->Collapsed, 1.0f);
  + }
  +
  // Close button
  if (p_open != NULL)
  {
  @@ -4457,10 +4463,8 @@ bool ImGui::Begin(const char* name, bool* p_open, const ImVec2& size_on_first_us
  *p_open = false;
  }
  + // Title text (FIXME: refactor text alignment facilities along with RenderText helpers)
  const ImVec2 text_size = CalcTextSize(name, NULL, true);
  - if (!(flags & ImGuiWindowFlags_NoCollapse))
  - RenderCollapseTriangle(window->Pos + style.FramePadding, !window->Collapsed, 1.0f);
  -
  ImVec2 text_min = window->Pos;
  ImVec2 text_max = window->Pos + ImVec2(window->Size.x, style.FramePadding.y*2 + text_size.y);
  ImRect clip_rect;
  @@ -6979,6 +6983,7 @@ bool ImGui::DragBehavior(const ImRect& frame_bb, ImGuiID id, float* v, float v_s
  if (v_speed == 0.0f && (v_max - v_min) != 0.0f && (v_max - v_min) < FLT_MAX)
  v_speed = (v_max - v_min) * g.DragSpeedDefaultRatio;
  +
  float v_cur = g.DragCurrentValue;
  const ImVec2 mouse_drag_delta = GetMouseDragDelta(0, 1.0f);
  float adjust_delta = 0.0f;
  