From 8ebc9553c3c1ea2140739281c52759f7bf7da94b Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Tue, 19 Feb 2019 07:17:10 +0530
Subject: [PATCH] Report negative percentage adjustments of cell sizes

Fixes #1394
---
 kitty/config_data.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/kitty/config_data.py b/kitty/config_data.py
index 4688f8320..e8cc1ff90 100644
--- a/kitty/config_data.py
+++ b/kitty/config_data.py
@@ -223,7 +223,10 @@ o('font_size', 11.0, long_text=_('Font size (in pts)'), option_type=to_font_size
 
 def adjust_line_height(x):
     if x.endswith('%'):
-        return float(x[:-1].strip()) / 100.0
+        ans = float(x[:-1].strip()) / 100.0
+        if ans < 0:
+            log_error('Percentage adjustments of cell sizes must be positive numbers')
+            return 0
     return int(x)