VisualEditor.REL1_31.diff

diff --git a/src/dm/ve.dm.Surface.js b/src/dm/ve.dm.Surface.js
index 6e09d7c2f..e8b01ad12 100644
--- a/src/dm/ve.dm.Surface.js
+++ b/src/dm/ve.dm.Surface.js
@@ -607,6 +607,30 @@ ve.dm.Surface.prototype.stopQueueingContextChanges = function () {
 	}
 };
 
+/**
+ * Set a linear selection at a specified range on the model
+ *
+ * @param {number} [from=0] Anchor offset
+ * @param {number} [to=from] Focus offset
+ */
+ve.dm.Surface.prototype.setLinearSelectionFromRange = function ( from, to ) {
+	this.setSelection( new ve.dm.LinearSelection( this.getDocument(), new ve.Range( from, to ) ) );
+};
+
+ve.dm.Surface.prototype.doReplacementRange = function( from, to, newText ) {
+	var replace = ve.dm.TransactionBuilder.static.newFromReplacement(
+		this.getDocument(),
+		new ve.Range( from, to ),
+		newText
+	);
+	var replaceChange = new ve.dm.Change(
+		this.getDocument().completeHistory.length,
+		[ replace ],
+		[ this.getDocument().store ]
+	);
+	replaceChange.applyTo( this );
+};
+
 /**
  * Set a linear selection at a specified range on the model
  *