Allow plugins to perform commit message and file content checks when editing a file in the browser

The 'File Edit' feature was introduced in 4.13.0 and allows plugins to prevent a file edit from being committed by raising the cancelable FileEditRequestedEvent.

The event in it's current form provides the repository, branch and the affected path, which is fine for permission-based checks. It does not however include the commit message or the new file content, which makes the event insufficient for plugin-proved checks that enforce commit message standards, or do content checks.

Adding the following fields to the event would make the event more useful:

• commit message
• updated file content

Workaround

 The File Edit feature can be globally disabled by adding the following setting to BITBUCKET_HOME/shared/bitbucket.properties and restarting:

feature.in.browser.editing=false
feature.file.editor=false