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* Pull request options migration and UI in settings * Add ignore whitespace functionality * Fix settings if pull requests are disabled * Fix migration transaction * Merge with Rebase functionality * UI changes and related functionality for pull request merging button * Implement squash functionality * Fix rebase merging * Fix pull request merge tests * Add squash and rebase tests * Fix API method to reuse default message functions * Some refactoring and small fixes * Remove more hardcoded values from tests * Remove unneeded check from API method * Fix variable name and comment typo * Fix reset commit count after PR merge