From 01b53534c393fb6c437d5d0911aceb748643c157 Mon Sep 17 00:00:00 2001
From: Fedor <fedor@mail.ru>
Date: Mon, 20 May 2019 09:01:12 +0300
Subject: [PATCH] The result of adding any percentage factor to a size that is
 zero should also be zero

---
 layout/base/nsLayoutUtils.h | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/layout/base/nsLayoutUtils.h b/layout/base/nsLayoutUtils.h
index 63253fd10..0a82dbf6a 100644
--- a/layout/base/nsLayoutUtils.h
+++ b/layout/base/nsLayoutUtils.h
@@ -1439,13 +1439,14 @@ public:
   /**
    * This function increases an initial intrinsic size, 'aCurrent', according
    * to the given 'aPercent', such that the size-increase makes up exactly
-   * 'aPercent' percent of the returned value.  If 'aPercent' is less than
-   * or equal to zero the original 'aCurrent' value is returned. If 'aPercent'
-   * is greater than or equal to 1.0 the value nscoord_MAX is returned.
+   * 'aPercent' percent of the returned value.  If 'aPercent' or 'aCurrent' are
+   * less than or equal to zero the original 'aCurrent' value is returned.
+   * If 'aPercent' is greater than or equal to 1.0 the value nscoord_MAX is
+   * returned.
    */
   static nscoord AddPercents(nscoord aCurrent, float aPercent)
   {
-    if (aPercent > 0.0f) {
+    if (aPercent > 0.0f && aCurrent > 0) {
       return MOZ_UNLIKELY(aPercent >= 1.0f) ? nscoord_MAX
         : NSToCoordRound(float(aCurrent) / (1.0f - aPercent));
     }