SuggestionPopup Allow replacing selected text to the beginning index until 
current cursor of TextInput or TextArea Component 
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                 Key: PIVOT-844
                 URL: https://issues.apache.org/jira/browse/PIVOT-844
             Project: Pivot
          Issue Type: Improvement
          Components: wtk
    Affects Versions: 2.0.2
            Reporter: Brendan
            Priority: Minor


SuggestionPopup used to replacing whole content of TextInput once user make a 
selection.  This creates difficulties in implementing, for example, a list of 
comma separated email addresses in recipients column. 
 I suggest to modify the replacing methodology to allow additional parameter of 
Index of the beginning word to input so that the SuggestionPopup will replace 
from the beginning index to the current caret (text cursor) with user 
selection.  Additionally, allow not only TextInput but also TextArea to be 
served with, which we can build a typing assistant like function.
The finding the beginning index is user code responsibility which opens up the 
choice of usages, like email address assistant where ";" is the separator and 
space as separator when general typing assistant.  The user code just need to 
use Java String Split to locate the closet word to the caret for 
SuggestionPopup. 

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