// OBSOLETED in 1.52 (between Aug 2017 and Oct 2017)
boolBegin(constchar*name,bool*p_open,constImVec2&size_on_first_use,floatbg_alpha_override=-1.0f,ImGuiWindowFlagsflags=0);// Use SetNextWindowSize() instead if you want to set a window size.
int_ChannelsCount;// [Internal] number of active channels (1+)
ImVector<ImDrawChannel>_Channels;// [Internal] draw channels for columns API (not resized down so _ChannelsCount may be smaller than _Channels.Size)
// If you want to create ImDrawList instances, pass them ImGui::GetDrawListSharedData() or create and use your own ImDrawListSharedData (so you can use ImDrawList without ImGui)
IMGUI_APIvoidPushClipRect(ImVec2clip_rect_min,ImVec2clip_rect_max,boolintersect_with_current_clip_rect=false);// Render-level scissoring. This is passed down to your render function but not used for CPU-side coarse clipping. Prefer using higher-level ImGui::PushClipRect() to affect logic (hit-testing and widget culling)