From 5b09e7a60ee7cf283a9a7040a6980a370ed8b32e Mon Sep 17 00:00:00 2001
From: Benedikt Stebner <b.stebner@outlook.de>
Date: Mon, 13 Sep 2021 18:56:26 +0200
Subject: [PATCH] Fix flag parsing

---
 src/Avalonia.Visuals/Media/PathMarkupParser.cs | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/Avalonia.Visuals/Media/PathMarkupParser.cs b/src/Avalonia.Visuals/Media/PathMarkupParser.cs
index 9fefcb6645..8b9d0833db 100644
--- a/src/Avalonia.Visuals/Media/PathMarkupParser.cs
+++ b/src/Avalonia.Visuals/Media/PathMarkupParser.cs
@@ -496,12 +496,18 @@ namespace Avalonia.Media
 
         private bool ReadBool(ref ReadOnlySpan<char> span)
         {
-            if (!ReadArgument(ref span, out var boolValue) || boolValue.Length != 1)
+            span = SkipWhitespace(span);
+            
+            if (span.IsEmpty)
             {
                 throw new InvalidDataException("Invalid bool rule.");
             }
             
-            switch (boolValue[0])
+            var c = span[0];
+            
+            span = span.Slice(1);
+            
+            switch (c)
             {
                 case '0':
                     return false;