Handle different separators in SVG parsing

Author: JimBobSquarePants

src/ImageSharp.Drawing/Path.cs

@@ -383,10 +383,42 @@ private static ReadOnlySpan<char> FindScaler(ReadOnlySpan<char> str, out float s
         str = TrimSeparator(str);
         scaler = 0;
 
+        bool hasDot = false;
         for (int i = 0; i < str.Length; i++)
         {
-            if (IsSeparator(str[i]) || i == str.Length)
+            char ch = str[i];
+
+            if (IsSeparator(ch))
+            {
+                scaler = ParseFloat(str[..i]);
+                return str[i..];
+            }
+
+            if (ch == '.')
+            {
+                if (hasDot)
+                {
+                    // Second decimal point starts a new number.
+                    scaler = ParseFloat(str[..i]);
+                    return str[i..];
+                }
+
+                hasDot = true;
+            }
+            else if ((ch is '-' or '+') && i > 0)
+            {
+                // A sign character mid-number starts a new number,
+                // unless it follows an exponent indicator.
+                char prev = str[i - 1];
+                if (prev is not 'e' and not 'E')
+                {
+                    scaler = ParseFloat(str[..i]);
+                    return str[i..];
+                }
+            }
+            else if (char.IsLetter(ch))
             {
+                // Hit a command letter; end this number.
                 scaler = ParseFloat(str[..i]);
                 return str[i..];
             }