coverity#706084 Unintended sign extension

and

coverity#706085 Unintended sign extension

Change-Id: I4bb617cd6927542dfef6dea89c5417ec4f9ed495

include/vcl/texteng.hxx

@@ -113,7 +113,7 @@ private:
 
     Font                maFont;
     Color               maTextColor;
-    sal_uInt16              mnCharHeight;
+    long                mnCharHeight;
     sal_uInt16              mnFixCharWidth100;
 
     sal_uLong               mnMaxTextLen;
@@ -259,7 +259,7 @@ public:
 
     sal_uLong           GetTextHeight() const;
     sal_uLong           CalcTextWidth();
-    sal_uInt16          GetCharHeight() const { return mnCharHeight; }
+    long                GetCharHeight() const { return mnCharHeight; }
 
     sal_uLong           GetParagraphCount() const;
     OUString            GetText( sal_uLong nParagraph ) const;

vcl/source/edit/texteng.cxx

@@ -203,7 +203,7 @@ void TextEngine::SetFont( const Font& rFont )
         mnDefTab = (sal_uInt16)aTextSize.Width();
         if ( !mnDefTab )
             mnDefTab = 1;
-        mnCharHeight = (sal_uInt16)aTextSize.Height();
+        mnCharHeight = aTextSize.Height();
         mnFixCharWidth100 = 0;
 
         FormatFullDoc();