Git Graph shows text color and ghosting issue

[wangyanweiie]

Describe the Bug
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Steps to Reproduce
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1. Go to '...'
2. Click on '...'
3. Scroll down to '...'
4. See error

Expected Behaviour
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Environment

• Git Graph Extension Version: [e.g. 1.13.0]
• Visual Studio Code Version: [e.g. 1.37.1]
• Operating System: [e.g. Windows 10]

Screenshots (optional)
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Additional Context (optional)
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