From a1c6c184ef34ea1b8143640f6442ce863e77f469 Mon Sep 17 00:00:00 2001
From: Khaled Hosny <khaled@aliftype.com>
Date: Sun, 2 May 2021 23:59:49 +0200
Subject: [PATCH] [mutator] Round lsb for CFF2 fonts as well

Otherwise head table compilation would fail because of the floating
point side bearing. The advance width is already rounded.
---
 Lib/fontTools/varLib/mutator.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Lib/fontTools/varLib/mutator.py b/Lib/fontTools/varLib/mutator.py
index db0e5f900..263c4e611 100644
--- a/Lib/fontTools/varLib/mutator.py
+++ b/Lib/fontTools/varLib/mutator.py
@@ -138,7 +138,7 @@ def interpolate_cff2_metrics(varfont, topDict, glyphOrder, loc):
 			# Happens with non-marking glyphs
 			lsb_delta = 0
 		else:
-			lsb = boundsPen.bounds[0]
+			lsb = otRound(boundsPen.bounds[0])
 			lsb_delta = entry[1] - lsb
 
 		if lsb_delta or width_delta: