Fix onValueChange was not triggered when replacing text after selecting it from right to left

[scrapooo]

onValueChange was not triggered when replacing text after selecting it from right to left

Description

onValueChange was not triggered when replacing text after selecting it from right to left, while selecting text from left to right works as expected. This inconsistency occurs because getTargetRanges cannot detect the direction of the user's selection.

Issue
Fixes: #5955

Example

onValueChange.not.trigger.mov

Context
If your change is non-trivial, please include a description of how the new logic works, and why you decided to solve it the way you did. (This is incredibly helpful so that reviewers don't have to guess your intentions based on the code, and without it your pull request will likely not be reviewed as quickly.)

Checks

• The new code matches the existing patterns and styles.
• The tests pass with yarn test.
• The linter passes with yarn lint. (Fix errors with yarn fix.)
• The relevant examples still work. (Run examples with yarn start.)
• You've added a changeset if changing functionality. (Add one with yarn changeset add.)

[changeset-bot]

🦋 Changeset detected

Latest commit: 013cb93

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
slate-react	Patch

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