From 623bf52bbe029451bec641c956ebb7dab5b1bac0 Mon Sep 17 00:00:00 2001
From: Yatao Li <yatli@microsoft.com>
Date: Sun, 22 Sep 2019 12:53:38 +0800
Subject: [PATCH] fix #70

---
 states.fs | 4 +++-
 ui.fs     | 1 +
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/states.fs b/states.fs
index cd6cf2e..e30cab7 100644
--- a/states.fs
+++ b/states.fs
@@ -168,7 +168,9 @@ let parseLineHeightOption (v: obj) =
         elif v.ToLowerInvariant() = "default" then
             Some Default
         else
-            Some(Absolute(float v))
+            let v = float v
+            if v > 0.0 then Some(Absolute v) 
+            else None
     | _ -> None
 
 let Shutdown code = _appLifetime.Shutdown code
diff --git a/ui.fs b/ui.fs
index fd22284..f6f6e92 100644
--- a/ui.fs
+++ b/ui.fs
@@ -300,6 +300,7 @@ module ui =
                 | States.Default -> float paint.FontSpacing
                 | States.Add h' -> (float paint.FontSpacing) + h'
             let h' = round(h'' * scaling) / scaling
+            let h' = max h' 1.0
 
             // calculate score
             let score' =