[jbosstools-issues] [JBoss JIRA] (JBIDE-10881) JBoss Tools JSP Editor is very slow with large selections

[Viacheslav Kabanovich (JIRA)]

Viacheslav Kabanovich created JBIDE-10881:
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             Summary: JBoss Tools JSP Editor is very slow with large selections
                 Key: JBIDE-10881
                 URL: https://issues.jboss.org/browse/JBIDE-10881
             Project: Tools (JBoss Tools)
          Issue Type: Bug
          Components: jsp/jsf/xml source editing
    Affects Versions: 3.3.0.M5
            Reporter: Viacheslav Kabanovich
            Assignee: Alexey Kazakov
             Fix For: 3.3.0.Beta1


1. Create a JSF KickStart project.
2.Open inputUserName.jsp
3. Copy 1000 times line
{code}
<h1><h:outputText value="#{Message.header}"/></h1>
{code}
4. Select these 1000 lines.
5. Delete and Save.
6. Undo by Ctrl+Z.

Editor freezes for several minutes. Debugger shows that most time is spent for method SelectionBar.updateNodes() called by SelectionBar.notifyChanged.

The problem is that when 1000 lines are removed, XML model sends thousands of deferred events about each removed XML node, so that instead of one call to SelectionBar.updateNodes(), there are thousands of them.

I suggest creating UIJob at the first call to SelectionBar.notifyChanged, and ignoring subsequent calls until the job is not done.

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