Image files render fitted into the editor area (editor and gutter
hidden); the title auto-fills with the file name. Text files always
load their content into the editor, replacing any text already there,
instead of only filling an empty editor. Title auto-fill still only
applies when the title is blank; a typed title is never overwritten.
Drawing and cropping tools are noted in the issue as possible future
work and are intentionally not implemented here.
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