Comments (1)
If you zoom you'll see that it is because under a certain size, the child windows adds a scrollbar:
And therefore there's no room for InnerRect contents anymore.
If you disable the scrollbar you can have childs that small:
ImGui::BeginChild("Child Window4", ImVec2(15, 15), ImGuiChildFlags_Border, ImGuiWindowFlags_NoScrollbar);
Window_internal_p = ImGui::GetCurrentWindow();
ImDrawList* draw_list4 = ImGui::GetWindowDrawList();
draw_list4->AddRect(ImVec2(Window_internal_p->Pos.x + 1, Window_internal_p->Pos.y + 1), ImVec2(Window_internal_p->Pos.x + Window_internal_p->Size.x - 1, Window_internal_p->Pos.y + Window_internal_p->Size.y - 1), IM_COL32(255, 0, 0, 255));
ImGui::EndChild();
By the way I think you should be using maths operators
#define IMGUI_DEFINE_MATH_OPERATORS
#include "imgui.h"
ImGui::BeginChild("Child Window1", ImVec2(20, 20), ImGuiChildFlags_Border);
ImGui::GetWindowDrawList()->AddRect(ImGui::GetWindowPos() + ImVec2(1,1), ImGui::GetWindowPos() +ImGui::GetWindowSize() - ImVec2(1,1), IM_COL32(255, 0, 0, 255));
ImGui::EndChild();
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