Declare E4TemplateCompletionProposalComputer as usable in non-UI Thread

Change-Id: I52d4ec04877b58924f5ca22cf5665140f7df7456
Signed-off-by: Mickael Istria <mistria@redhat.com>

bundles/org.eclipse.e4.tools.jdt.templates/plugin.xml

diff --git a/bundles/org.eclipse.e4.tools.jdt.templates/plugin.xml b/bundles/org.eclipse.e4.tools.jdt.templates/plugin.xml
index 30b8ff7..f0f7a13 100644
--- a/bundles/org.eclipse.e4.tools.jdt.templates/plugin.xml
+++ b/bundles/org.eclipse.e4.tools.jdt.templates/plugin.xml
@@ -14,8 +14,8 @@
       <javaCompletionProposalComputer
             activate="true"
             categoryId="org.eclipse.e4.tools.jdt.templates.e4ProposalCategory"
-            class="org.eclipse.e4.internal.tools.jdt.templates.E4TemplateCompletionProposalComputer">
-      </javaCompletionProposalComputer>
+            class="org.eclipse.e4.internal.tools.jdt.templates.E4TemplateCompletionProposalComputer"
+            requiresUIThread="false"/>
     </extension>
    <extension
          point="org.eclipse.ui.editors.templates">