Slowly going through the suggestion made by our headers script.

I tried not to kill "redundant" includes which are actually used
in the header, apology for mistakes.

src/Buffer.h

@@ -15,8 +15,6 @@
 #include "OutputEnums.h"
 #include "OutputParams.h"
 
-#include "insets/InsetCode.h"
-
 #include "support/strfwd.h"
 #include "support/types.h"
 

src/BufferView.h

@@ -18,7 +18,6 @@
 #include "DocumentClassPtr.h"
 #include "update_flags.h"
 
-#include "support/shared_ptr.h"
 #include "support/strfwd.h"
 #include "support/types.h"
 

src/Compare.h

@@ -14,8 +14,6 @@
 
 #include "Buffer.h"
 
-#include "support/FileName.h"
-
 #include <QObject>
 #include <QThread>
 #include <QTimer>

src/CoordCache.h

@@ -16,8 +16,6 @@
 
 #include "Dimension.h"
 
-#include "support/types.h"
-
 #include <map>
 
 namespace lyx {

src/Font.h

@@ -15,7 +15,6 @@
 #ifndef FONT_H
 #define FONT_H
 
-#include "ColorCode.h"
 #include "FontInfo.h"
 
 #include "support/strfwd.h"

src/LyXRC.h

@@ -18,7 +18,6 @@
 #ifndef LYXRC_H
 #define LYXRC_H
 
-#include "paper.h"
 #include "Length.h"
 
 #include "support/strfwd.h"

src/MetricsInfo.h

@@ -18,7 +18,6 @@
 #include "FontInfo.h"
 
 #include "support/strfwd.h"
-#include "support/types.h"
 
 #include <string>
 

src/Paragraph.h

@@ -19,8 +19,6 @@
 #include "FontEnums.h"
 #include "SpellChecker.h"
 
-#include "insets/InsetCode.h"
-
 #include "support/strfwd.h"
 #include "support/types.h"