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New release version 4.4.0

Update release version

Update version to 4.3.1

Update version 4.3.0

Fix pull request activity not scrolling to initial comment

The content was being initialized twice because of callback in head reference loading. We forgot to remove this call after making head reference not required to display main content.

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Fix logic and init value for zoom size determination.

Previous logic would throw an ArrayIndexOutOfBoundsException for new
installs.