Bug 275171 [Contributions] Customize Perspective action breaks editor pinning action
Using M7, I enabled editor pinning (i.e. Reuse editor) and pinned an editor using an action in the toolbar. I then disabled editor pinning ad then opened the customized perspective dialog. After this, enabling/disabling editor pinning does not make the Pin Editor action reappear.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/WorkbenchActionBuilder.java
/**
     * Returns whether any of the given infos have a welcome page.
     * 
     * @param infos the infos
     * @return <code>true</code> if a welcome page was found, <code>false</code> if not
     */
    private boolean hasWelcomePage(AboutInfo[] infos) {
        for (int i = 0; i < infos.length; i++) {
            if (infos[i].getWelcomePageURL() != null) {
            	return true;
            }
        }
        return false;
	}
    /**
     * Returns whether any of the given infos have tips and tricks.
     * 
     * @param infos the infos
     * @return <code>true</code> if tips and tricks were found, <code>false</code> if not
     */
    private boolean hasTipsAndTricks(AboutInfo[] infos) {
        for (int i = 0; i < infos.length; i++) {
            if (infos[i].getTipsAndTricksHref() != null) {
            	return true;
            }
        }
        return false;
	}
	/**
	 * Update the build actions on the toolbar and menu bar based on the current