From 6df25c3585ddbd26d806c141fc3b577f5525e214 Mon Sep 17 00:00:00 2001
From: Juergen Spitzmueller <spitz@lyx.org>
Date: Sun, 1 Oct 2023 11:08:11 +0200
Subject: [PATCH] When box background is "none", frame color != black and page
 color has been set

then use the page color as box background, not white
---
 src/insets/InsetBox.cpp | 8 ++++----
 src/insets/InsetBox.h   | 2 +-
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/insets/InsetBox.cpp b/src/insets/InsetBox.cpp
index 8adf0f7fe0..b1444ecd79 100644
--- a/src/insets/InsetBox.cpp
+++ b/src/insets/InsetBox.cpp
@@ -433,7 +433,7 @@ void InsetBox::latex(otexstream & os, OutputParams const & runparams) const
 			if (useFColorBox()) {
 				os << maybeBeginL
 				   << "\\fcolorbox{" << getFrameColor()
-				   << "}{" << getBackgroundColor()
+				   << "}{" << getBackgroundColor(buffer().params().isbackgroundcolor)
 				   << "}{" << "\\makebox";
 				needEndL = !maybeBeginL.empty();
 			} else
@@ -454,7 +454,7 @@ void InsetBox::latex(otexstream & os, OutputParams const & runparams) const
 			if (useFColorBox()) {
 				os << maybeBeginL
 				   << "\\fcolorbox{" << getFrameColor()
-				   << "}{" << getBackgroundColor() << "}";
+				   << "}{" << getBackgroundColor(buffer().params().isbackgroundcolor) << "}";
 				needEndL = !maybeBeginL.empty();
 			} else {
 				if (!cprotect.empty() && contains(runparams.active_chars, '^')) {
@@ -887,10 +887,10 @@ string const InsetBox::getFrameColor(bool const gui) const
 }
 
 
-string const InsetBox::getBackgroundColor() const
+string const InsetBox::getBackgroundColor(bool const custompb) const
 {
 	if (params_.backgroundcolor == "none")
-		return "white";
+		return custompb ? "page_backgroundcolor" : "white";
 	return params_.backgroundcolor;
 }
 
diff --git a/src/insets/InsetBox.h b/src/insets/InsetBox.h
index f4a743667b..29c713716c 100644
--- a/src/insets/InsetBox.h
+++ b/src/insets/InsetBox.h
@@ -166,7 +166,7 @@ private:
 	///
 	std::string const getFrameColor(bool const gui = false) const;
 	///
-	std::string const getBackgroundColor() const;
+	std::string const getBackgroundColor(bool const custompb = false) const;
 	///
 	bool useFColorBox() const;