Revert diff_match_patch upgrade (#16168)
Fixes #16027
Reverts #15514
This reverts commit 69a16cc.
Summary of the issue:
PR #15514 upgraded diff_match_patch from 1.0.2 to fast_diff_match_patch 2.0.1.
However, the newer version cannot handle particular unicode characters such as 🍰. The diff_match_patch process dies, NvDA can no longer report text changes, and NvDA hangs on exit.
Description of user facing changes
Printing unicode characters such as 🍰 in a terminal withn using diff_match_patch for speaking changes no longer causes NvDA to no longer report text changes and lock up on exit.
Description of development approach
Downgrade back to diff_match_patch 1.0.2.
