Prevent outputting \maketitle within an inset embedded in title.

Amends [e4ef8ddc0f8202/lyxgit]

(cherry picked from commit 0bddf448ef)

src/insets/Inset.h

@@ -448,6 +448,8 @@ public:
 	virtual InsetLayout const & getLayout() const;
 	///
 	virtual bool isPassThru() const { return getLayout().isPassThru(); }
+	/// Is this inset embedded in a title?
+	virtual bool isInTitle() const { return false; }
 	/// Is this inset's layout defined in the document's textclass?
 	bool undefined() const;
 	/// should this inset be handled like a normal character?

src/insets/InsetText.cpp

@@ -79,14 +79,14 @@ using graphics::PreviewLoader;
 /////////////////////////////////////////////////////////////////////
 
 InsetText::InsetText(Buffer * buf, UsePlain type)
-	: Inset(buf), drawFrame_(false), frame_color_(Color_insetframe),
+	: Inset(buf), drawFrame_(false), intitle_context_(false),
-	text_(this, type == DefaultLayout)
+	  frame_color_(Color_insetframe), text_(this, type == DefaultLayout)
 {
 }
 
 
 InsetText::InsetText(InsetText const & in)
-	: Inset(in), text_(this, in.text_)
+	: Inset(in), intitle_context_(false), text_(this, in.text_)
 {
 	drawFrame_ = in.drawFrame_;
 	frame_color_ = in.frame_color_;
@@ -793,6 +793,9 @@ void InsetText::updateBuffer(ParIterator const & it, UpdateType utype)
 			cnt.restoreLastLayout();
 			// FIXME cnt.restoreLastCounter()?
 		}
+		// Record in this inset is embedded in a title layout
+		// This is needed to decide when \maketitle is output.
+		intitle_context_ = it.paragraph().layout().intitle;
 	} else {
 		DocumentClass const & tclass = buffer().masterBuffer()->params().documentClass();
 		// Note that we do not need to call:

src/insets/InsetText.h

@@ -157,6 +157,8 @@ public:
 	///
 	virtual bool allowMultiPar() const { return getLayout().isMultiPar(); }
 	///
+	bool isInTitle() const { return intitle_context_; }
+	///
 	/// should paragraphs be forced to use the empty layout?
 	virtual bool forcePlainLayout(idx_type = 0) const
 		{ return getLayout().forcePlainLayout(); }
@@ -240,6 +242,8 @@ private:
 	///
 	bool drawFrame_;
 	///
+	bool intitle_context_;
+	///
 	ColorCode frame_color_;
 	///
 	Text text_;

src/output_latex.cpp

@@ -1496,7 +1496,8 @@ void latexParagraphs(Buffer const & buf,
 							<< "}\n";
 				}
 			}
-		} else if (runparams.need_maketitle && !runparams.have_maketitle && !layout.inpreamble) {
+		} else if (runparams.need_maketitle && !runparams.have_maketitle
+			   && !layout.inpreamble && !text.inset().isInTitle()) {
 			if (tclass.titletype() == TITLE_ENVIRONMENT) {
 				os << "\\end{" << from_ascii(tclass.titlename())
 						<< "}\n";