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* Initial undo related machinery added to TextArea * Initial undo implementation * Basic undo and redo * Some more fleshing out of undo and redo * Skeleton code for managing TextArea history * Initial implementation of undo & redo checkpointing in TextArea * Increase checkpoint characters * Restoring the selection in the TextArea and then restoring it on undo * Adding docstrings to undo_batch and redo_batch in the TextArea * Batching edits of the same type * Batching edits of the same type * Keeping edits containing newlines in their own batch * Checking for newline characters in insertion or replacement during undo checkpoint creation. Updating docstrings in history.py * Fix mypy warning * Performance improvement * Add history checkpoint on cursor movement * Fixing merge conflict in Edit class * Fixing error in merge conflict resolution * Remove unused test file * Remove unused test file * Initial testing of undo and redo * Testing for undo redo * Updating lockfile * Add an extra test * Fix: setting the `text` property programmatically should invalidate the edit history * Improving docstrings * Rename EditHistory.reset() to EditHistory.clear() * Add docstring to an exception * Add a pause after focus/blur in a test * Forcing CI colour * Update focus checkpoint test * Try to force color in pytest by setting --color=yes in PYTEST_ADDOPTS in env var on Github Actions * Add extra assertion in a test * Toggle text_area has focus to trigger checkpoint in history * Apply grammar/wording suggestions from code review Co-authored-by: Rodrigo Girão Serrão <5621605+rodrigogiraoserrao@users.noreply.github.com> * Making max checkpoints configurable in TextArea history * Improve a docstring * Update changelog * Spelling fixes * More spelling fixes * Americanize spelling of tab_behaviour (->tab_behavior) * Update CHANGELOG regarding `tab_behaviour`->`tab_behavior` --------- Co-authored-by: Rodrigo Girão Serrão <5621605+rodrigogiraoserrao@users.noreply.github.com>