some improvements to font handling, but Miniterminal still renders only black blocks

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@12148 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/servers/app/Painter.h

@@ -311,6 +311,7 @@ class Painter {
 	// font file, it uses the FontManager to locate a file
 	// by Family and Style
 	AGGTextRenderer*			fTextRenderer;
+	uint32						fLastFamilyAndStyle;
 };
 
 // SetHighColor

headers/private/servers/app/ServerFont.h

@@ -79,7 +79,7 @@ public:
 	const char *GetPath(void) const { return fStyle->GetPath(); }
 	uint16 StyleID(void) const { return fStyle->GetID(); }
 	uint16 FamilyID(void) const { return fStyle->Family()->GetID(); }
-	uint32 GetFamilyAndStyle(void);
+	uint32 GetFamilyAndStyle(void) const;
 
 	BRect BoundingBox(void);
 	void Height(font_height *fh);