Removed extraneous (1,1) padding on child window (pointed out in #125)

imgui.cpp

@@ -1136,7 +1136,7 @@ public:
     ImVec2      CursorPos() const                       { return DC.CursorPos; }
     float       TitleBarHeight() const                  { return (Flags & ImGuiWindowFlags_NoTitleBar) ? 0 : FontSize() + GImGui->Style.FramePadding.y * 2.0f; }
     ImGuiAabb   TitleBarAabb() const                    { return ImGuiAabb(Pos, Pos + ImVec2(SizeFull.x, TitleBarHeight())); }
-    ImVec2      WindowPadding() const                   { return ((Flags & ImGuiWindowFlags_ChildWindow) && !(Flags & ImGuiWindowFlags_ShowBorders)) ? ImVec2(1,1) : GImGui->Style.WindowPadding; }
+    ImVec2      WindowPadding() const                   { return ((Flags & ImGuiWindowFlags_ChildWindow) && !(Flags & ImGuiWindowFlags_ShowBorders)) ? ImVec2(0,0) : GImGui->Style.WindowPadding; }
     ImU32       Color(ImGuiCol idx, float a=1.f) const  { ImVec4 c = GImGui->Style.Colors[idx]; c.w *= GImGui->Style.Alpha * a; return ImGui::ColorConvertFloat4ToU32(c); }
     ImU32       Color(const ImVec4& col) const          { ImVec4 c = col; c.w *= GImGui->Style.Alpha; return ImGui::ColorConvertFloat4ToU32(c); }
 };