Fix shaded box UI color (#7395) as good as it gets ATM

src/BufferParams.cpp

@@ -819,6 +819,7 @@ string BufferParams::readToken(Lexer & lex, string const & token,
 		lex.eatLine();
 		string color = lex.getString();
 		boxbgcolor = lyx::rgbFromHexName(color);
+		lcolor.setColor("boxbgcolor", color);
 	} else if (token == "\\paperwidth") {
 		lex >> paperwidth;
 	} else if (token == "\\paperheight") {

src/insets/InsetBox.cpp

@@ -17,6 +17,7 @@
 #include "Buffer.h"
 #include "BufferParams.h"
 #include "BufferView.h"
+#include "ColorSet.h"
 #include "Cursor.h"
 #include "DispatchResult.h"
 #include "FuncStatus.h"
@@ -184,6 +185,20 @@ bool InsetBox::forcePlainLayout(idx_type) const
 }
 
 
+ColorCode InsetBox::backgroundColor(PainterInfo const &) const
+{
+	if (params_.type != "Shaded")
+		return getLayout().bgcolor();
+	// FIXME: This hardcoded color is a hack!
+	if (buffer().params().boxbgcolor == lyx::rgbFromHexName("#ff0000"))
+		return getLayout().bgcolor();
+	ColorCode c = lcolor.getFromLyXName("boxbgcolor");
+	if (c == Color_none)
+		return getLayout().bgcolor();
+	return c;
+}
+
+
 void InsetBox::doDispatch(Cursor & cur, FuncRequest & cmd)
 {
 	switch (cmd.action()) {

src/insets/InsetBox.h

@@ -102,6 +102,8 @@ public:
 	///
 	DisplayType display() const { return Inline; }
 	///
+	ColorCode backgroundColor(PainterInfo const &) const;
+	///
 	bool allowParagraphCustomization(idx_type = 0) const { return !forcePlainLayout(); }
 	///
 	bool forcePlainLayout(idx_type = 0) const;