Bug 94674 [Preferences] Preferences dialog separator under Title for pages does not stretch all the way across
The separator under the Header title for a preference page should stretch from the border of the sash to the far right with no margins in between.
bundles/org.eclipse.jface/src/org/eclipse/jface/preference/PreferenceDialog.java
boolean hasFailedOK = false;
				try {
					
					Iterator nodes = preferenceManager.getElements(PreferenceManager.PRE_ORDER)
							.iterator();
					while (nodes.hasNext()) {
						IPreferenceNode node = (IPreferenceNode) nodes.next();
						IPreferencePage page = node.getPage();
						if (page != null) {
							if (!page.performOk()){
								hasFailedOK = true;
								return;
							}
						}
					}
				} catch (Exception e) {
					handleException(e);
				} finally {
					
					if(hasFailedOK)
						return;
					
					if (!errorOccurred)
						 
					    
						handleSave();
					
					close();
				}
			}