RFR: 5080391: ArrayIndexOutOfBounds during "undo" of Right-to-Left text insert [v2]

[Prasanta Sadhukhan]

On Fri, 7 Oct 2022 18:33:52 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

> I do not think this makes a difference. Well, the first insertion does make a difference: it changes the text component state so from left-to-right only to bidirectional.
> 
> The following manipulations just add more Arabic text, so that the entire text run is right-to-left.
> 
> You want to test the situation where the change from left-to-right to bidirectional and component orientation occurs for the first time, and the text is inserted in the middle of a text run, in the end of text. You should probably, re-create `JTextArea` and `UndoManager` to test such scenarios.
> 
> You should also verify the result of undo. If you insert text by one character, each undo should remove that character from the text.
> 
> If you don't test the result of undo, you don't know whether the text was modified as expected or not.

Test updated to test insertion individually at end, middle and beginning and also test results of undo.

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PR: https://git.openjdk.org/jdk/pull/10446