(svn r25987) [1.3] -Backport from trunk:

- Fix: When clearing font cache, also clear layout cache [FS#5737] (r25860)
- Fix: Goto button in order window was not always lowered when it should [FS#5783] (r25858, 25857)
- Fix: Searching for a suitable font failed, if one of the fonts had no '?' glyph, and no baseset is installed [FS#5704] (r25822, r25820)
- Fix: Sprite 0 was considered available, even if no baseset was loaded (r25821)

src/blitter/8bpp_optimized.cpp

@@ -112,7 +112,7 @@ void Blitter_8bppOptimized::Draw(Blitter::BlitterParams *bp, BlitterMode mode, Z
 	}
 }
 
-Sprite *Blitter_8bppOptimized::Encode(SpriteLoader::Sprite *sprite, AllocatorProc *allocator)
+Sprite *Blitter_8bppOptimized::Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator)
 {
 	/* Make memory for all zoom-levels */
 	uint memory = sizeof(SpriteData);