Properly mark a buffer as internal

Checking the extension of the temporary filename doesn't work anymore
since the naming of temporary files was corrected.

(cherry picked from commit 5279d5a8a5)

src/Buffer.cpp

@@ -195,6 +195,9 @@ public:
 	/// is this an unnamed file (New...)?
 	bool unnamed;
 
+	/// is this an internal bufffer?
+	bool internal_buffer;
+
 	/// buffer is r/o
 	bool read_only;
 
@@ -352,12 +355,12 @@ static FileName createBufferTmpDir()
 Buffer::Impl::Impl(Buffer * owner, FileName const & file, bool readonly_,
 	Buffer const * cloned_buffer)
 	: owner_(owner), lyx_clean(true), bak_clean(true), unnamed(false),
-	  read_only(readonly_), filename(file), file_fully_loaded(false),
-	  toc_backend(owner), macro_lock(false), timestamp_(0),
-	  checksum_(0), wa_(0), gui_(0), undo_(*owner), bibinfo_cache_valid_(false),
-	  bibfile_cache_valid_(false), cite_labels_valid_(false),
-	  cloned_buffer_(cloned_buffer), clone_list_(0), doing_export(false),
-	  parent_buffer(0)
+	  internal_buffer(false), read_only(readonly_), filename(file),
+	  file_fully_loaded(false), toc_backend(owner), macro_lock(false),
+	  timestamp_(0), checksum_(0), wa_(0), gui_(0), undo_(*owner),
+	  bibinfo_cache_valid_(false), bibfile_cache_valid_(false), 
+	  cite_labels_valid_(false), cloned_buffer_(cloned_buffer),
+	  clone_list_(0), doing_export(false), parent_buffer(0)
 {
 	if (!cloned_buffer_) {
 		temppath = createBufferTmpDir();
@@ -376,6 +379,7 @@ Buffer::Impl::Impl(Buffer * owner, FileName const & file, bool readonly_,
 	bibfile_status_ = cloned_buffer_->d->bibfile_status_;
 	unnamed = cloned_buffer_->d->unnamed;
 	cite_labels_valid_ = cloned_buffer_->d->cite_labels_valid_;
+	internal_buffer = cloned_buffer_->d->internal_buffer;
 }
 
 
@@ -2580,7 +2584,13 @@ bool Buffer::isUnnamed() const
 /// retrieving fileName() nor for checking if it is unnamed or not.
 bool Buffer::isInternal() const
 {
-	return fileName().extension() == "internal";
+	return d->internal_buffer;
+}
+
+
+void Buffer::setInternal(bool flag)
+{
+	d->internal_buffer = flag;
 }
 
 

src/Buffer.h

@@ -364,6 +364,8 @@ public:
 	/// automatically saved, nor it needs to trigger any "do you want to save ?" question.
 	bool isInternal() const;
 
+	void setInternal(bool flag);
+
 	/// Mark this buffer as dirty.
 	void markDirty();
 

src/CutAndPaste.cpp

@@ -471,6 +471,7 @@ void putClipboard(ParagraphList const & paragraphs,
 	// would not be needed.
 	static Buffer * buffer = theBufferList().newBuffer(
 		FileName::tempName("clipboard.internal").absFileName());
+	buffer->setInternal(true);
 	buffer->setUnnamed(true);
 	buffer->paragraphs() = paragraphs;
 	buffer->inset().setBuffer(*buffer);

src/frontends/qt4/GuiWorkArea.cpp

@@ -1371,6 +1371,7 @@ EmbeddedWorkArea::EmbeddedWorkArea(QWidget * w): GuiWorkArea(w)
 {
 	buffer_ = theBufferList().newBuffer(
 		support::FileName::tempName("embedded.internal").absFileName());
+	buffer_->setInternal(true);
 	buffer_->setUnnamed(true);
 	buffer_->setFullyLoaded(true);
 	setBuffer(*buffer_);