Is it possible to remove the empty placeholder after moving the existing views in JavaPerspective?

[hithisispolarbear]

For users who have installed the Copilot plugin, we're working on finding the most suitable location for the Chat view. As shown in the screenshot below, we’ve refined the layout in the Java Perspective by stacking the Tasks, Outline, and Chat views together for a cleaner look.

However, two empty placeholders still remain in the layout.
Would it be possible to remove them?

What I did is:

    <perspectiveExtension
          targetID="org.eclipse.jdt.ui.JavaPerspective">
       <view
             id="com.microsoft.copilot.eclipse.ui.chat.ChatView"
             minimized="false"
             ratio="0.66"
             relationship="right"
             relative="org.eclipse.ui.editorss">
       </view>
       <view
             id="org.eclipse.ui.views.ContentOutline"
             minimized="false"
             relationship="stack"
             relative="com.microsoft.copilot.eclipse.ui.chat.ChatView">
       </view>
       <view
             id="org.eclipse.mylyn.tasks.ui.views.tasks"
             minimized="false"
             relationship="stack"
             relative="com.microsoft.copilot.eclipse.ui.chat.ChatView">
       </view>
    </perspectiveExtension>

What we expect:

Currently we only achieved this expectation in the next version 2025-09 by changing the original position of tasks view in this PR below.
eclipse-mylyn/org.eclipse.mylyn#745
However, this cannot take effect on the previous versions. So, we'd like to know if we can remove the empty placeholders above, which can take effect on all versions.

[iloveeclipse]

Have you tried

    <perspectiveExtension
          targetID="org.eclipse.jdt.ui.JavaPerspective">
       <view
             id="com.microsoft.copilot.eclipse.ui.chat.ChatView"
             minimized="false"
             relationship="stack"
             relative="org.eclipse.ui.views.ContentOutline">
       </view>
       <view
             id="org.eclipse.mylyn.tasks.ui.views.tasks"
             minimized="false"
             relationship="stack"
             relative="com.microsoft.copilot.eclipse.ui.chat.ChatView">
       </view>
    </perspectiveExtension>

[hithisispolarbear]

Here is the test result. 'tasks' view is moved to the bottom. An empty placeholder is at the top.

[iloveeclipse]

Crazy. I would propose, simply ignore Mylyn and define

    <perspectiveExtension
          targetID="org.eclipse.jdt.ui.JavaPerspective">
       <view
             id="com.microsoft.copilot.eclipse.ui.chat.ChatView"
             minimized="false"
             relationship="stack"
             relative="org.eclipse.ui.views.ContentOutline">
       </view>
    </perspectiveExtension>

People using older Mylyn versions who would be annoyed by Mylyn Tasks view could close / move it manually.
For the future, once Mylyn fix is integrated, the problem will disappear.
Don't waste more time on that.