From 09fcbf225e61be0a0b5732a6dcd51326f98316fc Mon Sep 17 00:00:00 2001
From: Alexandre Bury <alexandre.bury@gmail.com>
Date: Tue, 24 Jul 2018 22:53:56 -0700
Subject: [PATCH] Fix underflow in ScrollView

---
 src/views/scroll_view.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/views/scroll_view.rs b/src/views/scroll_view.rs
index dbd483f..651a731 100644
--- a/src/views/scroll_view.rs
+++ b/src/views/scroll_view.rs
@@ -38,6 +38,8 @@ pub struct ScrollView<V> {
     show_scrollbars: bool,
 
     /// How much padding should be between content and scrollbar?
+    ///
+    /// scrollbar_padding.x is the vertical padding before the horizontal scrollbar.
     scrollbar_padding: Vec2,
 
     /// Initial position of the cursor when dragging.
@@ -364,7 +366,9 @@ where
         let available = self.available_size();
         // The number of steps is 1 + the "extra space"
         let steps = (available + (1, 1)).saturating_sub(lengths);
-        steps * self.offset / (self.inner_size + (1, 1) - available)
+        let max_offset = self.inner_size.saturating_sub(available) + (1, 1);
+
+        steps * self.offset / max_offset
     }
 
     /// Apply the scrolling strategy to the current scroll position.