Improved appearence of regexp insets (at least I hope so), also suggested in #6498 (Regex looks like math).

- added a frame around regexp insets, with a customizable dedicated color code
- regexp insets font turned to texttt
- recovered back the preamble snippet allowing for latex compilation of regexp insets, something that happens if you have instant preview on.


git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@33329 a592a061-630c-0410-9148-cb99ea01b6c8

src/Color.cpp

@@ -241,6 +241,7 @@ ColorSet::ColorSet()
 	{ Color_buttonhoverbg, N_("button background under focus"), "buttonhoverbg", "#C7C7CA", "buttonhoverbg" },
 	{ Color_paragraphmarker, N_("paragraph marker"), "paragraphmarker", grey80, "paragraphmarker"},
 	{ Color_inherit, N_("inherit"), "inherit", "black", "inherit" },
+	{ Color_regexpframe, N_("regexp frame"), "regexpframe", "green", "regexpframe" },
 	{ Color_ignore, N_("ignore"), "ignore", "black", "ignore" },
 	{ Color_ignore, 0, 0, 0, 0 }
 	};

src/ColorCode.h

@@ -196,6 +196,8 @@ enum ColorCode
 
 	/// Color is inherited
 	Color_inherit,
+	/// Color for regexp frame
+	Color_regexpframe,
 	/// For ignoring updates of a color
 	Color_ignore
 };

src/mathed/InsetMathHull.cpp

@@ -312,7 +312,18 @@ int InsetMathHull::defaultColSpace(col_type col)
 
 docstring InsetMathHull::standardFont() const
 {
-	return from_ascii(type_ == hullNone ? "lyxnochange" : "mathnormal");
+	const char *font_name;
+	switch (type_) {
+	case hullRegexp:
+		font_name = "texttt";
+		break;
+	case hullNone:
+		font_name = "lyxnochange";
+		break;
+	default:
+		font_name = "mathnormal";
+	}
+	return from_ascii(font_name);
 }
 
 
@@ -393,6 +404,11 @@ void InsetMathHull::draw(PainterInfo & pi, int x, int y) const
 {
 	use_preview_ = previewState(pi.base.bv);
 
+	if (type_ == hullRegexp) {
+		Dimension const dim = dimension(*pi.base.bv);
+		pi.pain.rectangle(x + 1, y - dim.ascent() + 1,
+			dim.width() - 2, dim.height() - 2, Color_regexpframe);
+	}
 	if (use_preview_) {
 		// one pixel gap in front
 		preview_->draw(pi, x + 1, y);
@@ -620,6 +636,10 @@ void InsetMathHull::validate(LaTeXFeatures & features) const
 	if (ams())
 		features.require("amsmath");
 
+	if (type_ == hullRegexp)
+		features.addPreambleSnippet(
+			"\\newcommand{\\regexp}[1]{\\fbox{\\texttt{#1}}}");
+
 	// Validation is necessary only if not using AMS math.
 	// To be safe, we will always run mathedvalidate.
 	//if (features.amsstyle)