Do not rely on hardcoded color when determining boxbgcolor

src/Buffer.cpp

@@ -948,6 +948,7 @@ int Buffer::readHeader(Lexer & lex)
 	params().notefontcolor = RGBColor(0xCC, 0xCC, 0xCC);
 	params().isnotefontcolor = false;
 	params().boxbgcolor = RGBColor(0xFF, 0, 0);
+	params().isboxbgcolor = false;
 	params().html_latex_start.clear();
 	params().html_latex_end.clear();
 	params().html_math_img_scale = 1.0;

src/BufferParams.cpp

@@ -461,9 +461,10 @@ BufferParams::BufferParams()
 	fontcolor = lyx::rgbFromHexName("#000000");
 	isfontcolor = false;
 	// light gray is the default font color for greyed-out notes
-	isnotefontcolor = false;
 	notefontcolor = lyx::rgbFromHexName("#cccccc");
+	isnotefontcolor = false;
 	boxbgcolor = lyx::rgbFromHexName("#ff0000");
+	isboxbgcolor = false;
 	compressed = lyxrc.save_compressed;
 	for (int iter = 0; iter < 4; ++iter) {
 		user_defined_bullet(iter) = ITEMIZE_DEFAULTS[iter];
@@ -1060,6 +1061,7 @@ string BufferParams::readToken(Lexer & lex, string const & token,
 		string color = lex.getString();
 		boxbgcolor = lyx::rgbFromHexName(color);
 		lcolor.setColor("boxbgcolor", color);
+		isboxbgcolor = true;
 	} else if (token == "\\paperwidth") {
 		lex >> paperwidth;
 	} else if (token == "\\paperheight") {
@@ -1382,7 +1384,7 @@ void BufferParams::writeFile(ostream & os, Buffer const * buf) const
 		os << "\\fontcolor " << lyx::X11hexname(fontcolor) << '\n';
 	if (isnotefontcolor)
 		os << "\\notefontcolor " << lyx::X11hexname(notefontcolor) << '\n';
-	if (boxbgcolor != lyx::rgbFromHexName("#ff0000"))
+	if (isboxbgcolor)
 		os << "\\boxbgcolor " << lyx::X11hexname(boxbgcolor) << '\n';
 
 	for (auto const & br : branchlist()) {

src/BufferParams.h

@@ -399,6 +399,8 @@ public:
 	bool isnotefontcolor;
 	///
 	RGBColor boxbgcolor;
+	///
+	bool isboxbgcolor;
 	/// \param index should lie in the range 0 <= \c index <= 3.
 	Bullet & temp_bullet(size_type index);
 	Bullet const & temp_bullet(size_type index) const;

src/frontends/qt/GuiDocument.cpp

@@ -164,6 +164,7 @@ bool is_fontcolor;
 lyx::RGBColor set_notefontcolor;
 bool is_notefontcolor;
 lyx::RGBColor set_boxbgcolor;
+bool is_boxbgcolor;
 bool forced_fontspec_activation;
 
 } // anonymous namespace
@@ -2292,6 +2293,7 @@ void GuiDocument::changeBoxBackgroundColor()
 		colorButtonStyleSheet(newColor));
 	// save color
 	set_boxbgcolor = rgbFromHexName(fromqstr(newColor.name()));
+	is_boxbgcolor = true;
 	change_adaptor();
 }
 
@@ -2302,6 +2304,7 @@ void GuiDocument::deleteBoxBackgroundColor()
 	theApp()->getRgbColor(Color_shadedbg, set_boxbgcolor);
 	colorModule->boxBackgroundPB->setStyleSheet(
 		colorButtonStyleSheet(rgb2qcolor(set_boxbgcolor)));
+	is_boxbgcolor = false;
 	change_adaptor();
 }
 
@@ -3521,6 +3524,7 @@ void GuiDocument::applyView()
 	bp_.notefontcolor = set_notefontcolor;
 	bp_.isnotefontcolor = is_notefontcolor;
 	bp_.boxbgcolor = set_boxbgcolor;
+	bp_.isboxbgcolor = is_boxbgcolor;
 
 	// numbering
 	if (bp_.documentClass().hasTocLevels()) {
@@ -4050,6 +4054,7 @@ void GuiDocument::paramsToDialog()
 	colorModule->boxBackgroundPB->setStyleSheet(
 		colorButtonStyleSheet(rgb2qcolor(bp_.boxbgcolor)));
 	set_boxbgcolor = bp_.boxbgcolor;
+	is_boxbgcolor = bp_.isboxbgcolor;
 
 	// numbering
 	int const min_toclevel = documentClass().min_toclevel();

src/insets/InsetBox.cpp

@@ -220,8 +220,7 @@ ColorCode InsetBox::backgroundColor(PainterInfo const &) const
 		return getLayout().bgcolor();
 
 	if (params_.type == "Shaded") {
-		// FIXME: This hardcoded color is a hack!
-		if (buffer().params().boxbgcolor == lyx::rgbFromHexName("#ff0000"))
+		if (buffer().params().isboxbgcolor)
 			return getLayout().bgcolor();
 
 		ColorCode c = lcolor.getFromLyXName("boxbgcolor");