How to set BeginComboPreview height

[llxiaoyuan]

        if (ImGui::BeginCombo("##combo_path", NULL, ImGuiComboFlags_CustomPreview))
        {

            ...

            ImGui::EndCombo();
        }

        if (ImGui::BeginComboPreview())
        {
            ImGui::Button("dwabudciawg", { 0,200 });
            ImGui::EndComboPreview();
        }

How to set BeginComboPreview height, show button fully

[ocornut]

Framed Item height are always == GetFrameHeight() == FontSize + style.FramePadding.y, you currently can't set that height otherwise than changing e.g. FramePadding.

Linking to #1658