Warn users if they click to enlarge huge images
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	MingleTerminator
	Dec 8 2014, 7:21 PM

Description

Migrated from: https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/933

Narrative

As a user, I can get a warning if I click to enlarge a huge image in Media Viewer, so that I can prevent it from crashing my browser.

Acceptance Criteria

After clicking, the image area becomes darkened (75%) as it is described in #942
If the user is trying to open a huge image (criteria to be defined by the developers based on the chances of a size to crash the browser):
A "large" version of the image is displayed instead of the "huge" original one.
A message is displayed in addition to showing the loading indicator to communicate that the full-resolution version is still available.
An additional 3s delay may be introduced to make sure that the user is able to read the message while waiting for the image.
When displaying the image or going back to the Media Viewer, none of the above elements should be visible.

Note: This issue also takes place in the File: page, so it is not new. But Media Viewer makes it a lot easier for users to accidentally load a huge file. So we should seriously consider this feature, if it is easy to implement and if we can identify a threshold that is acceptable to most community members.

Design notes

The loading indicator on the left, should animate as described in #924
The panel is dark yellow (#e0a00b) and uses a similar style to the tooltip but without a pointing triangle. The bottom border is an even darker yellow (#c68400). Text is white.