xOffset isn't set on first build, but is is when building again without changing anything

[cjdunn]

Weird low priority bug I noticed:
For glyphs where one of the base glyphs are missing (not common for final pruodtion, but hapeens early on when doing a quick pass at accents), strangely the first time I run Build Glyphs there is no xOffset written for the .cmb diacritic (which does exist in the UFO), the second time I run build this value is written as zero. The doesn't happen if both base glyphs are present.

Eg, in this example, I haven't added the /dotlessi glyph yet. Here's the diff between 1st run and 2nd run (with no changes to recipe), this is the diff:

 	<advance width="1000"/>
 	<outline>
 		<component base="dotlessi"/>
-		<component base="tilde.cmb" yOffset="79"/>
+		<component base="tilde.cmb" xOffset="0" yOffset="79"/>
 	</outline>
 	<lib>
 		<dict>

I there some kind of normalization that's happening the second time, which doesn't happen the first time?

[colinmford]

@cjdunn are you using the ufonormalizer in any way?

from mojo.UI import getDefault
print(getDefault("shouldNormalizeOnSave"))

I've noticed something similar off and on, I just assumed it had to do with ufonormalizer rather than any particular plugin, but if you're not using it, then it might be glyphConstruction!