MagnumFontConverter: avoid double padding around the glyphs.

The glyphs were exported with the padding and when they were inserted
back into the cache later, the padding was added again.

src/Plugins/MagnumFont/Test/font.conf

@@ -19,11 +19,11 @@ unicode=76
 advance=11 0
 glyph=0
 [glyph]
-position=0 0
-rectangle=0 0 0 0
+position=24 24
+rectangle=24 24 -24 -24
 [glyph]
-position=1 -12
-rectangle=-8 -20 88 56
+position=25 12
+rectangle=16 4 64 32
 [glyph]
-position=1 10
-rectangle=-24 -16 40 152
+position=25 34
+rectangle=0 8 16 128

src/Plugins/MagnumFontConverter/MagnumFontConverter.cpp

@@ -78,12 +78,15 @@ std::vector<std::pair<std::string, Containers::Array<unsigned char>>> MagnumFont
         group->setValue("glyph", found == glyphIdMap.end() ? 0 : glyphIdMap.at(glyphId));
     }
 
-    /* Save glyph properties in order which preserves their IDs */
+    /* Save glyph properties in order which preserves their IDs, remove padding
+       from the values so they aren't added twice when using the font later */
+    /** @todo Some better way to handle this padding stuff */
     for(UnsignedInt oldGlyphId: inverseGlyphIdMap) {
         std::pair<Vector2i, Rectanglei> glyph = (*cache)[oldGlyphId];
         Utility::ConfigurationGroup* group = configuration.addGroup("glyph");
-        group->setValue("position", glyph.first);
-        group->setValue("rectangle", glyph.second);
+        group->setValue("position", glyph.first+cache->padding());
+        group->setValue("rectangle", Rectanglei(glyph.second.bottomLeft()+cache->padding(),
+                                                glyph.second.topRight()-cache->padding()));
     }
 
     std::ostringstream confOut;