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
return;
				int shift = event.x - sash.getBounds().x;
				GridData data = (GridData) rightControl.getLayoutData();
				int newWidthHint = data.widthHint + shift;
				if (newWidthHint < 20)
					return;
				Point computedSize = getShell().computeSize(SWT.DEFAULT, SWT.DEFAULT);
				Point currentSize = getShell().getSize();
				
				
				boolean customSize = !computedSize.equals(currentSize);
				data.widthHint = newWidthHint;
				setLastTreeWidth(newWidthHint);
				composite.layout(true);
				
				computedSize = getShell().computeSize(SWT.DEFAULT, SWT.DEFAULT);
				
				
				if (customSize)
					computedSize.x = Math.max(computedSize.x, currentSize.x);
				computedSize.y = Math.max(computedSize.y, currentSize.y);
				if (computedSize.equals(currentSize))
					return;
				setShellSize(computedSize.x, computedSize.y);
				lastShellSize = getShell().getSize();
			}
		});
		return sash;
	}
	/**