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
register(quickStartAction);
	        }
        }
        
        
        
        String tipsAndTricksKey = IDEActionFactory.TIPS_AND_TRICKS.getId();
        String showTipsAndTricks = prefs.getString(tipsAndTricksKey);
        if (sameState && "true".equals(showTipsAndTricks)) { 
            tipsAndTricksAction = IDEActionFactory.TIPS_AND_TRICKS
					.create(window);
			register(tipsAndTricksAction);
        }
        else if (sameState && "false".equals(showTipsAndTricks)) { 
        	
        }
        else {
        	
	    	if (infos == null) {
	    		infos = IDEWorkbenchPlugin.getDefault().getFeatureInfos();
	    	}
	    	boolean found = hasTipsAndTricks(infos);
	    	prefs.setValue(tipsAndTricksKey, found);
	    	if (found) {
	            tipsAndTricksAction = IDEActionFactory.TIPS_AND_TRICKS
						.create(window);
				register(tipsAndTricksAction);
		    }
        }
    }