Fix LT-21127: Crash opening project in texts (#369)

jtmaxwell3 · web-flow · commit b138092f3936 · 2026-03-06T13:46:35.000-08:00
diff --git a/src/SIL.LCModel/DomainServices/ITextUtils.cs b/src/SIL.LCModel/DomainServices/ITextUtils.cs
@@ -1579,7 +1579,8 @@ public bool IsWordforming(int ich)
 				isLabel = true;
 			// The character is wordforming if it is not a label And it is either word forming or
 			// a number (numbers added for LT-10746)
-			return !isLabel && (m_tss.IsCharWordForming(ich, m_wsManager) || Character.IsNumeric(m_tss.CharAt(ich)));
+			return !isLabel && (m_tss.IsCharWordForming(ich, m_wsManager) ||
+				(!char.IsLowSurrogate(m_tss.Text[ich]) && Character.IsNumeric(m_tss.CharAt(ich))));
 		}
 
 		/// <summary>

Original file line number	Diff line number	Diff line change
`@@ -1579,7 +1579,8 @@ public bool IsWordforming(int ich)`
`1579`	`1579`	`isLabel = true;`
`1580`	`1580`	`// The character is wordforming if it is not a label And it is either word forming or`
`1581`	`1581`	`// a number (numbers added for LT-10746)`
`1582`		`- return !isLabel && (m_tss.IsCharWordForming(ich, m_wsManager) \|\| Character.IsNumeric(m_tss.CharAt(ich)));`
	`1582`	`+ return !isLabel && (m_tss.IsCharWordForming(ich, m_wsManager) \|\|`
	`1583`	`+ (!char.IsLowSurrogate(m_tss.Text[ich]) && Character.IsNumeric(m_tss.CharAt(ich))));`
`1583`	`1584`	`}`
`1584`	`1585`
`1585`	`1586`	`/// <summary>`