How to override keybindings from a parent scheme in Eclipse 4? - eclipse

Question

I am upgrading an RCP application to use Eclipse 4.2.1. One of the problems I am having is that keybindings in my custom scheme are no longer overriding Eclipse key bindings.
I have reproduced the problem in a sample plug-in project. This was created by following, then adapting, this tutorial. I can't attach the project itself, so have just included the contents of the plugin.xml file.
I have my own scheme which extends the default scheme:
<scheme
id="test.MyScheme"
name="My Scheme"
parentId="org.eclipse.ui.defaultAcceleratorConfiguration">
</scheme>
I have a command with the key binding Ctrl+N:
<key
commandId="test.MyCommand"
contextId="org.eclipse.ui.contexts.window"
schemeId="test.MyScheme"
sequence="M1+N">
</key>
In Eclipse 3.7.2, pressing Ctrl+N would run my command.
In Eclipse 4.2.1, it pops up a box asking me to choose between running my command and launching the 'New' wizard. What do I need to do to restore the original behaviour?
Full contents of plugin.xml below.
<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.4"?>
<plugin>
<extension
id="application"
point="org.eclipse.core.runtime.applications">
<application>
<run
class="test.Application">
</run>
</application>
</extension>
<extension
point="org.eclipse.ui.perspectives">
<perspective
name="RCP Perspective"
class="test.Perspective"
id="test.perspective">
</perspective>
</extension>
<extension
point="org.eclipse.ui.commands">
<command
defaultHandler="test.MyCommandHandler"
id="test.MyCommand"
name="My Command">
</command>
</extension>
<extension
point="org.eclipse.ui.menus">
<menuContribution
allPopups="false"
locationURI="menu:org.eclipse.ui.main.menu">
<menu
id="fileMenu"
label="File">
<command
commandId="test.MyCommand"
label="My Command"
style="push">
</command>
</menu>
</menuContribution>
</extension>
<extension
point="org.eclipse.ui.bindings">
<key
commandId="test.MyCommand"
contextId="org.eclipse.ui.contexts.window"
schemeId="test.MyScheme"
sequence="M1+N">
</key>
<scheme
id="test.MyScheme"
name="My Scheme"
parentId="org.eclipse.ui.defaultAcceleratorConfiguration">
</scheme>
</extension>
<extension
id="product"
point="org.eclipse.core.runtime.products">
<product
application="test.application"
name="My Product">
<property
name="appName"
value="My Product">
</property>
<property
name="preferenceCustomization"
value="plugin_customization.ini">
</property>
</product>
</extension>
</plugin>

Answer 1

The old mechanism appears to just not work but there is another way.
Add an extension org.eclipse.e4.workbench.model
Add a processor fragment
Find the offending key binding: MAppliction->MBindingTable->MKeyBinding
Remove the key binding from the binding table

Answer 2

The following file might be missing inside your plugin directory next to the plugin.xml:
plugin_customization.ini
Its content should be:
org.eclipse.ui/KEY_CONFIGURATION_ID=test.MyScheme
See also, this tutorial and the chapter here.