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Split AC was added in CL crrev.com/c/2424985 . It allows e.g. the input
'a c' to match the text 'a [b ]c[ d]'

When generating the text selections from word matches, it removes empty
matches and merges adjacent matches. E.g. the input 'a b' produces the
selections 'a b[ c]' instead of 'a| |b[ c]'. This is desirable usually,
but not desirable for the last selection which is used to determine the
cursor position; merging or filtering the last selection incorrectly
alters the cursor.

This CL makes sure to preserve the last selection and, therefore, the
correct cursor. E.g. the input 'a c' produces selections 'a [b ]c|'
instead of 'a [b ]c'.

Bug: 1062446
Change-Id: Icfb13321d86454a8a2fbc89289fefda53287b770
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2601046
Commit-Queue: manuk hovanesian <manukh@chromium.org>
Reviewed-by: Orin Jaworski <orinj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839170}