(svn r24007) [1.2] -Backport from trunk:

- Fix: Improve rounding when converting display speeds to internal speeds [FS#5079] (r23995)
- Fix: Also reset the font glyph cache when switching blitters (r23992, r23987)
- Fix: [NewGRF] Also display the cargo subtype for vehicles which have no capacity, but a subtype [FS#5076] (r23991)

src/fontcache.cpp

@@ -974,6 +974,14 @@ void UninitFreeType()
 	_library = NULL;
 }
 
+/**
+ * Reset cached glyphs.
+ */
+void ClearFontCache()
+{
+	ResetGlyphCache(true);
+	ResetGlyphCache(false);
+}
 
 static FT_Face GetFontFace(FontSize size)
 {