STORM-2140 LLLineEditor enabled-state cannot properly set via XUI

doc/contributions.txt

@@ -205,6 +205,7 @@ Ansariel Hiller
 	MAINT-6752
 	MAINT-6773
 	MAINT-6906
+	STORM-2140
 Aralara Rajal
 Arare Chantilly
 	CHUIBUG-191

indra/llui/lllineeditor.cpp

@@ -335,6 +335,7 @@ void LLLineEditor::reshape(S32 width, S32 height, BOOL called_from_parent)
 
 void LLLineEditor::setEnabled(BOOL enabled)
 {
+	LLUICtrl::setEnabled(enabled);
 	mReadOnly = !enabled;
 	setTabStop(!mReadOnly);
 	updateAllowingLanguageInput();