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The editor should be loaded with first paragraph indented by 1.5em.

Testing

• The indent button should indent list, block and heading.
• The outdent button should outdent list, block and heading.
• The indentation should be done in steps by 40px.
• Indenting paragraph with 1.5em should first set it to 40px.
• Outdenting paragraph with 1.5em should remove indent.