lets-plot-compose/src/desktopMain/kotlin/org/jetbrains/letsPlot/compose/PlotPanelComposeCanvas.kt [111:121]:
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    val finalModifier = if (errorMessage != null) {
        modifier.background(Color.LightGray)
    } else {
        if (containsBackground(modifier)) {
            // Do not change the user-defined background
            modifier
        } else {
            // Use background color from the plot theme
            val lpColor = PlotThemeHelper.plotBackground(processedPlotSpec)
            val lpBackground = Color(lpColor.red, lpColor.green, lpColor.blue, lpColor.alpha)
            modifier.background(lpBackground)
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lets-plot-compose/src/desktopMain/kotlin/org/jetbrains/letsPlot/compose/PlotPanelSwingComponent.kt [70:80]:
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    val finalModifier = if (errorMessage != null) {
        modifier.background(Color.LightGray)
    } else {
        if (containsBackground(modifier)) {
            // Do not change the user-defined background
            modifier
        } else {
            // Use background color from the plot theme
            val lpColor = PlotThemeHelper.plotBackground(processedPlotSpec)
            val lpBackground = Color(lpColor.red, lpColor.green, lpColor.blue, lpColor.alpha)
            modifier.background(lpBackground)
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