Keep name of member displayed to guest if member leaves channel

Description

For Both Mobile and Web/Desktop

When a guest is still in the channel, any posts by members that left that channel still remain with the name of the member displayed as `teammate name display` setting dictates. Currently, the name displays “someone” when the member is removed - this should remain the member’s name and not change for the guest.

The member's name should only be displayed in center chat window.

QA Test Steps

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Mana

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Assignee

Martin Kraft

QA Assignee

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Reporter

Dennis Kittrell

Fix versions

Mattermost Team

Enterprise

Sprint

Labels

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QA Testing Areas

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GitHub Issue

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Components

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