Added ImGuiStyleVar_WindowRounding enum for PushStyleVar() API

imgui.cpp

@@ -2720,6 +2720,7 @@ static float* GetStyleVarFloatAddr(ImGuiStyleVar idx)
     switch (idx)
     {
     case ImGuiStyleVar_Alpha: return &g.Style.Alpha;
+    case ImGuiStyleVar_WindowRounding: return &g.Style.WindowRounding;
     case ImGuiStyleVar_TreeNodeSpacing: return &g.Style.TreeNodeSpacing;
     case ImGuiStyleVar_ColumnsMinSpacing: return &g.Style.ColumnsMinSpacing;
     }

imgui.h

@@ -412,6 +412,7 @@ enum ImGuiStyleVar_
 {
     ImGuiStyleVar_Alpha,             // float
     ImGuiStyleVar_WindowPadding,     // ImVec2
+    ImGuiStyleVar_WindowRounding,    // float
     ImGuiStyleVar_FramePadding,      // ImVec2
     ImGuiStyleVar_ItemSpacing,       // ImVec2
     ImGuiStyleVar_ItemInnerSpacing,  // ImVec2