Desktop: Clicking on image in external image preview opens the image within the app

Description

Reproed on community-release, but not mysql.test running the 4.3.1 desktop app on Mac. This seems to only happen on servers using an image proxy (or possibly certain image proxies).

Repro steps:
1) Post an external image link such as

2) Click on the image to open the View Image modal
3) Click on the image in the modal

Observed: On a server with an image proxy, the image opens within the app. Otherwise, the image opens in the browser
Expected: The image always opens in the browser

QA Test Steps

See description

Status

Mana

None

Assignee

Dean Whillier

QA Assignee

None

Reporter

Harrison Healey

Epic Link

None

Fix versions

Mattermost Team

Apps

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QA Testing Areas

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GitHub Issue

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