BugInfo:
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I have selected first 10 characters by programmatic using selection methods and then i was trying to insert a button component using insert component method in JTextPane.
API says,Inserts a component into the document as a replacement for the currently selected content.But selection shifts to next 10 characters and the caret shows at end of the selection instead of showing after the inserted component.

I typed some characters for replacing the selection contents but it erases selected content including component also instead of erasing only selected content.

Steps to reproduce:
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1. Run the attached code.

Now you can see the component followed by some selected content.But as per my program i am expecting behavior should be following manner.

Component followed by content with out selection and the caret should be after the component.
If i type some characters then it appends to beginning position of existing content.


Actual Behavior:
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Component followed by some selected content and typed some characters,it erases the selected portion including component.

Please check the attached code snippet.

I can reproduce the issue even with 5.0 also.