From: Tuukka Lehtonen <tuukka.lehtonen@semantum.fi>
Date: Wed, 30 Sep 2020 05:41:03 +0000 (+0300)
Subject: Add isDisposed checking to avoid unexpected NPE
X-Git-Url: https://gerrit.simantics.org/r/gitweb?p=simantics%2Fplatform.git;a=commitdiff_plain;h=215cb2930ed3fb362b2951d1da3080abec976972;hp=215cb2930ed3fb362b2951d1da3080abec976972

Add isDisposed checking to avoid unexpected NPE

In this case ctx.getContentContext() would return null when the canvas
context was already disposed.

gitlab #614

(cherry picked from commit 930da66f9b2d7d1acba3e5dc805a323933abb780)
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