Feature: Flush cipherChannel before persisting lastModifed

Walkthrough

The modifications primarily address an issue with the Cryptomator project, where the order of operations during the closing of a cleartext file channel could inadvertently alter the lastModified timestamp. The changes ensure that the ciphertext channel is flushed before the last modified time is set, aligning with the objective to maintain data integrity by syncing file write operations with timestamp corrections.

Changes

File Path	Change Summary
`.../cryptofs/ch/CleartextFileChannel.java`	Added import, made `persistLastModified` method visible for testing, added `force` in `implCloseChannel`
`.../cryptofs/ch/CleartextFileChannelTest.java`	Added imports for Mockito, added `testCloseFlushBeforePersist` method

Assessment against linked issues

Objective	Addressed	Explanation
Investigate the issue where closing the cleartext file channel might change the lastModified timestamp (#205)	✅
Ensure the ciphertext channel is explicitly flushed before setting the last modified time (#205)	✅
Evaluate the impact of the current close process on the lastModified timestamp and propose a solution (#205)	✅
Review the `flush()` method in CleartextFileChannel for synchronization of file operations with timestamp (#205)	❓	The provided summary does not detail changes to the `flush()` method, making it unclear if this review occurred.
Verify the functionality of the close listener in OpenCryptoFile for proper deregistration and closure (#205)	❌	The summary does not mention modifications related to the close listener functionality.

Poem

In the realm of bytes and bits, a rabbit hopped and fixed the glitches, With a leap and a bound, it patched the code, where time stamps twitched. 🐇💻✨ Through the cryptic maze, it danced, ensuring data's faithful stance, Now close the file, have no fear, for the rabbit's magic keeps it clear. 🌟📁🛡️

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cryptomator / cryptofs