FTETextField RTE

Steps to reproduce:
1. Run the bug file for https://bugs.adobe.com/jira/browse/SDK-25949 (Enable FTE Text when you compile).
2. Select rtl from the dropdown.
3.

Actual Results:

RangeError: The supplied index is out of bounds.
at mx.core::FTETextField/getLineMetrics()[/Users/cframpto/dev/4.x/frameworks/projects/spark/src/mx/core/FTETextField.as:2234]
at mx.core::UIFTETextField/get baselinePosition()[/Users/cframpto/dev/4.x/frameworks/projects/spark/src/mx/core/UIFTETextField.as:737]
at mx.controls::Label/get baselinePosition()[/Users/cframpto/dev/4.x/frameworks/projects/framework/src/mx/controls/Label.as:417]
at mx.containers::FormItem/updateDisplayList()[/Users/cframpto/dev/4.x/frameworks/projects/framework/src/mx/containers/FormItem.as:840]
at mx.core::UIComponent/validateDisplayList()[/Users/cframpto/dev/4.x/frameworks/projects/framework/src/mx/core/UIComponent.as:8680]
at mx.core::Container/validateDisplayList()[/Users/cframpto/dev/4.x/frameworks/projects/framework/src/mx/core/Container.as:3296]
at mx.managers::LayoutManager/validateDisplayList()[/Users/cframpto/dev/4.x/frameworks/projects/framework/src/mx/managers/LayoutManager.as:663]
at mx.managers::LayoutManager/doPhasedInstantiation()[/Users/cframpto/dev/4.x/frameworks/projects/framework/src/mx/managers/LayoutManager.as:736]
at mx.managers::LayoutManager/validateNow()[/Users/cframpto/dev/4.x/frameworks/projects/framework/src/mx/managers/LayoutManager.as:795]
at spark.components::Application/resizeHandler()[/Users/cframpto/dev/4.x/frameworks/projects/spark/src/spark/components/Application.as:1215]
at spark.components::Application/commitProperties()[/Users/cframpto/dev/4.x/frameworks/projects/spark/src/spark/components/Application.as:938]
at mx.core::UIComponent/validateProperties()[/Users/cframpto/dev/4.x/frameworks/projects/framework/src/mx/core/UIComponent.as:7904]
at mx.managers::LayoutManager/validateProperties()[/Users/cframpto/dev/4.x/frameworks/projects/framework/src/mx/managers/LayoutManager.as:572]
at mx.managers::LayoutManager/doPhasedInstantiation()[/Users/cframpto/dev/4.x/frameworks/projects/framework/src/mx/managers/LayoutManager.as:730]
at mx.managers::LayoutManager/doPhasedInstantiationCallback()[/Users/cframpto/dev/4.x/frameworks/projects/framework/src/mx/managers/LayoutManager.as:1072]

Even though get baselinePosition does a validateNow() before it tries to access the textLines, validateNow short circuits and doesn't create the text lines.

Expected Results:

Workaround (if any):