Description

Playing in standalone or a packaged game on Linux, the mouse can escape the viewport which can cause the game to lose focus or be hidden behind another window when the mouse is clicked.

This is inconsistent with behavior on Windows.
This behavior is the same when "lock mouse to viewport" is set as well.

Steps to Reproduce
  1. Open UE4Editor
  2. Run game in standalone (not in full screen)
  3. Quickly move the mouse left and right while click the LMB

Result:
The mouse will exit the game window and clicking will cause it to lose focus

Expected: Movement of the mouse does not cause the game to lose focus.

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Fixed
ComponentUE - Platform - Linux
Affects Versions4.10
Target Fix4.20
Fix Commit3895251
Main Commit4052378
Release Commit4095966
CreatedJan 18, 2016
ResolvedFeb 19, 2018
UpdatedMay 31, 2018
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