[Editor] Avoid to use event.movementX/Y when resizing an editor

[calixteman]

Those propertie can have some non-expected values so use screenX/Y instead.

[calixteman]

/botio integrationtest

[moz-tools-bot]

From: Bot.io (Linux m4)

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Received

Command cmd_integrationtest from @calixteman received. Current queue size: 0

Live output at: http://54.241.84.105:8877/f973452ea010e20/output.txt

[moz-tools-bot]

From: Bot.io (Windows)

---

Received

Command cmd_integrationtest from @calixteman received. Current queue size: 0

Live output at: http://54.193.163.58:8877/a0c5193a9ca76fd/output.txt

[moz-tools-bot]

From: Bot.io (Linux m4)

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Failed

Full output at http://54.241.84.105:8877/f973452ea010e20/output.txt

Total script time: 9.07 mins

• Integration Tests: FAILED

[moz-tools-bot]

From: Bot.io (Windows)

---

Failed

Full output at http://54.193.163.58:8877/a0c5193a9ca76fd/output.txt

Total script time: 18.80 mins

• Integration Tests: FAILED

[Snuffleupagus]

r=me, thank you.

[calixteman]

/botio integrationtest

[moz-tools-bot]

From: Bot.io (Windows)

---

Received

Command cmd_integrationtest from @calixteman received. Current queue size: 0

Live output at: http://54.193.163.58:8877/47d6535a35fff05/output.txt

[moz-tools-bot]

From: Bot.io (Linux m4)

---

Received

Command cmd_integrationtest from @calixteman received. Current queue size: 0

Live output at: http://54.241.84.105:8877/fe65179cbe7ffec/output.txt

[moz-tools-bot]

From: Bot.io (Linux m4)

---

Success

Full output at http://54.241.84.105:8877/fe65179cbe7ffec/output.txt

Total script time: 8.77 mins

• Integration Tests: Passed

[moz-tools-bot]

From: Bot.io (Windows)

---

Success

Full output at http://54.193.163.58:8877/47d6535a35fff05/output.txt

Total script time: 18.94 mins

• Integration Tests: Passed

[Snuffleupagus]

(I missed that the first version of the patch had test-failures, when originally reviewing, since there's still some intermittent failures in the integration-tests.)