Fix wrong EOL mode for big files

Closes #1054, Fixes #1002

The problem is if fread() is called multiple times, then
UnicodeConvertor->convert() is called multiple times, which causes
m_pNewBuf to point to the last read in chunk. Then after the entire file
was loaded, getEOLFormatForm(UnicodeConvertor.getNewBuf(), ...) was being
used which was only trying to detect the EOL mode from the last read in
chunk. If this last chunk started with \n then the file was detected as
Unix line endings. The file linked from issue #1002 happened to have just
the right situation where this occurred.

PowerEditor/src/ScitillaComponent/Buffer.cpp

@@ -627,15 +627,6 @@ BufferID FileManager::loadFile(const TCHAR * filename, Document doc, int encodin
 
 		if (encoding == -1)
 		{
-			// 3 formats : WIN_FORMAT, UNIX_FORMAT and MAC_FORMAT
-			if (nullptr != UnicodeConvertor.getNewBuf())
-			{
-				FormatType format = getEOLFormatForm(UnicodeConvertor.getNewBuf(), UnicodeConvertor.getNewSize(),ndds._format);
-				buf->setFormat(format);
-			}
-			else
-				buf->setFormat(ndds._format);
-
 			UniMode um = UnicodeConvertor.getEncoding();
 			if (um == uni7Bit)
 				um = (ndds._openAnsiAsUtf8) ? uniCookie : uni8Bit;
@@ -647,9 +638,10 @@ BufferID FileManager::loadFile(const TCHAR * filename, Document doc, int encodin
             // Test if encoding is set to UTF8 w/o BOM (usually for utf8 indicator of xml or html)
             buf->setEncoding((encoding == SC_CP_UTF8)?-1:encoding);
             buf->setUnicodeMode(uniCookie);
-			buf->setFormat(bkformat);
 		}
 
+		buf->setFormat(bkformat);
+
 		//determine buffer properties
 		++_nextBufferID;
 		return id;
@@ -1467,6 +1459,8 @@ inline bool FileManager::loadFileData(Document doc, const TCHAR * filename, char
 			{
 				lenConvert = UnicodeConvertor->convert(data, lenFile);
 				_pscratchTilla->execute(SCI_APPENDTEXT, lenConvert, (LPARAM)(UnicodeConvertor->getNewBuf()));
+				if (format == FormatType::unknown)
+					format = getEOLFormatForm(UnicodeConvertor->getNewBuf(), UnicodeConvertor->getNewSize(), FormatType::unknown);
 			}
 
 			if (_pscratchTilla->execute(SCI_GETSTATUS) != SC_STATUS_OK)