Bug 281126 [CSS] Illegal state exc from tab-height
If you just type a space in the CSS Editors SWT example you will get traces in the console failing on CSSValue.getFloatValue() for tab-height.
tests/org.eclipse.e4.ui.tests.css.swt/src/org/eclipse/e4/ui/tests/css/swt/CTabFolderTest.java
assertEquals("true", engine.retrieveCSSProperty(folderToTest, "unselected-close-visible", null));
		folderToTest = createTestCTabFolder("CTabFolder { unselected-close-visible: false}");
		assertEquals(false, folderToTest.getUnselectedCloseVisible());
		assertEquals("false", engine.retrieveCSSProperty(folderToTest, "unselected-close-visible", null));
	}
	
	public void testUnselectedImageVisible() throws Exception {
		CTabFolder folderToTest = createTestCTabFolder("CTabFolder { unselected-image-visible: true}");
		assertEquals(true, folderToTest.getUnselectedImageVisible());
		assertEquals("true", engine.retrieveCSSProperty(folderToTest, "unselected-image-visible", null));
		folderToTest = createTestCTabFolder("CTabFolder { unselected-image-visible: false}");
		assertEquals(false, folderToTest.getUnselectedImageVisible());
		assertEquals("false", engine.retrieveCSSProperty(folderToTest, "unselected-image-visible", null));
	}
	
	public void testRetrievePropertyNull() {
		Shell shell = createShell("Shell {color:red}");
		assertEquals(null, engine.retrieveCSSProperty(shell, "border-visible", null));
		assertEquals(null, engine.retrieveCSSProperty(shell, "maximized", null));
		assertEquals(null, engine.retrieveCSSProperty(shell, "maximize-visible", null));
		assertEquals(null, engine.retrieveCSSProperty(shell, "minimize-visible", null));
		assertEquals(null, engine.retrieveCSSProperty(shell, "mru-visible", null));
		assertEquals(null, engine.retrieveCSSProperty(shell, "show-close", null));
		assertEquals(null, engine.retrieveCSSProperty(shell, "simple", null));
		assertEquals(null, engine.retrieveCSSProperty(shell, "single", null));
		assertEquals(null, engine.retrieveCSSProperty(shell, "unselected-close-visible", null));
		assertEquals(null, engine.retrieveCSSProperty(shell, "unselected-image-visible", null));
	}	
}