base

Smart word detection in text selection. Manual merge in HC of 63569.

Selecting between words selects the spaces instead of the closest word, facilitating
paste insertion vs word replacement.

Pasting adds/removes space before and after if needed so that pasted text is not appended to
existing text.

Change-Id: Iffa0fb573d3535af72b639d05c5dc0721e80bda5