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Revert "Support block delete with word and line modifiers (#77172)" (#79674)

This reverts commit 75453e6ac6647e014765ae6d863e199efc152a16 because it breaks flutter/test/rendering/editable_test.dart

Landing on red to fix the build.
G
Greg Spencer committed
8859f7a7999d4a84d2b162d11c805c6882d423bd
Parent: 23015dc
Committed by GitHub <noreply@github.com> on 4/2/2021, 10:08:13 PM