Selectable(): not specifying a width default to using max of label width and remaining width

imgui.cpp

@@ -6527,7 +6527,7 @@ bool ImGui::Selectable(const char* label, bool selected, const ImVec2& size_arg)
     const ImGuiID id = window->GetID(label);
     const ImVec2 label_size = CalcTextSize(label, NULL, true);
     
-    const float w = window->Pos.x + ImGui::GetContentRegionMax().x - window->DC.CursorPos.x;
+    const float w = ImMax(label_size.x, window->Pos.x + ImGui::GetContentRegionMax().x - window->DC.CursorPos.x);
     const ImVec2 size(size_arg.x != 0.0f ? size_arg.x : w, size_arg.y != 0.0f ? size_arg.y : label_size.y);
     const ImRect bb(window->DC.CursorPos, window->DC.CursorPos + size);
     ItemSize(bb);