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Related to #1154
First, document the existing Attachment previewing process, including which content types are supported out of the box.
Next, resolve some
ManagedAttachment
toAttachment
proxying issues. TheManagedAttachment
class is what gets dispatched as part oftrix-attachment-add
events. It does not inherit fromAttachment
, but instead proxies method calls and property access. Prior to this commit, there were some proxy definition gaps.For example, the
ManagedAttachment
declares a proxy for thesetAttribute
method. Unfortunately, anAttachment.setAttribute
method did not exist prior to these changes. This commit remedies that.Next, this commit adds proxy definitions for
Attachment.setPreviewURL
andAttachment.getPreviewURL
so that event handlers can customize the value from the event-levelManagedAttachment
instance, without deeply reaching into theAttachment
instance (viaevent.attachment.attachment
).