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@ -365,10 +365,9 @@ struct NewGRFParametersWindow : public Window {
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case WID_NP_BACKGROUND: {
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if (!this->editable) break;
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auto it = this->vscroll->GetScrolledItemFromWidget(this->grf_config->param_info, pt.y, this, WID_NP_BACKGROUND);
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if (it == this->grf_config->param_info.end()) break;
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uint num = this->vscroll->GetScrolledRowFromWidget(pt.y, this, WID_NP_BACKGROUND);
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if (num >= this->vscroll->GetCount()) break;
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uint num = it - this->grf_config->param_info.begin();
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if (this->clicked_row != num) {
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DeleteChildWindows(WC_QUERY_STRING);
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HideDropDownMenu(this);
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@ -380,7 +379,7 @@ struct NewGRFParametersWindow : public Window {
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int x = pt.x - r.left;
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if (_current_text_dir == TD_RTL) x = r.Width() - 1 - x;
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GRFParameterInfo &par_info = it->has_value() ? it->value() : GetDummyParameterInfo(num);
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GRFParameterInfo &par_info = this->GetParameterInfo(num);
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/* One of the arrows is clicked */
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uint32 old_val = par_info.GetValue(this->grf_config);
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