Fix duplicate skeletons during labels merge

[gitttt-1234]

Description

This PR fixes the duplicate skeleton issue when merging labels file. After every update to the labels file, we check if there's a existing skeleton that matches with a new Skeleton associated with an instance in the Labeled frame. If the skeleton doesn't match, then we add it to the list of skeletons in the Labels object.

Types of changes

• [ ] Bugfix
• [ ] New feature
• [ ] Refactor / Code style update (no logical changes)
• [ ] Build / CI changes
• [ ] Documentation Update
• [ ] Other (explain)

Does this address any currently open issues?

• #2025
• #1090
• #713

Outside contributors checklist

• [ ] Review the guidelines for contributing to this repository
• [ ] Read and sign the CLA and add yourself to the authors list
• [ ] Make sure you are making a pull request against the develop branch (not main). Also you should start your branch off develop
• [ ] Add tests that prove your fix is effective or that your feature works
• [ ] Add necessary documentation (if appropriate)

Thank you for contributing to SLEAP!

:heart:

Summary by CodeRabbit

• Refactor
  • Enhanced the internal label management for more reliable merging and display.
• New Features
  • Improved the label import process, resulting in more accurate grouping and consolidation.
  • Streamlined the export flow by automatically applying default filenames, removing the need for manual file selection.
• Tests
  • Updated tests to align with the revised label import behaviors.
  • Adjusted assertions in tests to reflect changes in expected track counts.
  • Removed a test function related to skeleton unification, indicating a shift in testing strategy.

[coderabbitai[bot]]

Walkthrough

This update refines the label update process in the dataset module and adjusts GUI command tests. In the dataset code, the merging logic for skeletons, nodes, and tracks has been reorganized for clarity and reliability. Additionally, the expected track count for DeepLabCut imports has been modified, and a test function related to skeleton unification has been removed, indicating a shift in testing focus.

Changes

File(s)	Change Summary
sleap/io/dataset.py	Modified the _update_from_labels method in the Labels class to update skeletons only when empty and to add a merge block when the merge flag is set. Simplified node updates by removing merge logic, and streamlined track merging. Also includes minor code cleanup for clarity.
tests/gui/test_commands.py	Updated the expected track count in test_import_labels_from_dlc_folder (from 3 to 2).
tests/io/test_dataset.py	Removed the test_dont_unify_skeletons function, which tested the behavior of the Labels class regarding skeleton unification.

Sequence Diagram(s)

sequenceDiagram
    participant L as Labels Instance
    participant S as Skeletons List
    participant N as Nodes List
    participant T as Tracks List

    L->>L: _update_from_labels(merge)
    alt Skeleton list is empty
        L->>S: Create new skeletons
    else merge flag is true
        L->>S: Check and merge duplicate skeletons
    end
    alt Nodes list is empty
        L->>N: Build nodes from skeletons
    end
    alt Tracks list is empty
        L->>T: Update and merge tracks
    end

Poem

In the code garden, I happily hop,
Updating skeletons till the bugs all stop.
Nodes and tracks align in a row,
Merging logic makes the clean code glow.
Hoppity changes from a rabbit with a techy heart 🐇💻!

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📥 Commits

Reviewing files that changed from the base of the PR and between d497566bb331208540d104684abc442deaeb87e3 and 74455e24b178081275b9a31d474a6a325980553b.

📒 Files selected for processing (2)

• sleap/io/dataset.py (2 hunks)
• tests/gui/test_commands.py (1 hunks)

🚧 Files skipped from review as they are similar to previous changes (2)

• tests/gui/test_commands.py
• sleap/io/dataset.py

⏰ Context from checks skipped due to timeout of 90000ms (3)

• GitHub Check: Tests (macos-14)
• GitHub Check: Tests (windows-2022)
• GitHub Check: Tests (ubuntu-22.04)

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[codecov[bot]]

Codecov Report

:x: Patch coverage is 97.14286% with 1 line in your changes missing coverage. Please review. :white_check_mark: Project coverage is 76.15%. Comparing base (7991f14) to head (74455e2). :warning: Report is 181 commits behind head on develop.

Files with missing lines	Patch %	Lines
sleap/io/dataset.py	97.14%	1 Missing :warning:

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2075      +/-   ##
===========================================
+ Coverage    75.43%   76.15%   +0.71%     
===========================================
  Files          134      134              
  Lines        24749    25050     +301     
===========================================
+ Hits         18670    19077     +407     
+ Misses        6079     5973     -106     

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