Bug 89824 [Forms] Position of Go button in Help Search view changes
If you expand and contract the Default Scope area the position of the Go button will shift (and the combo will shrink and grow). I will attach two screencaps - note the space to the right of the Go button.
bundles/org.eclipse.ui.forms/src/org/eclipse/ui/forms/widgets/TableWrapLayout.java
Point size = computeSize(td.childIndex, cwidth, td.indent, td.maxWidth, td.maxHeight);
				td.compWidth = cwidth;
				if (td.heightHint != SWT.DEFAULT) {
					size = new Point(size.x, td.heightHint);
				}
				td.compSize = size;
				RowSpan rowspan = (RowSpan) rowspans.get(child);
				if (rowspan == null) {
					rowHeights[i] = Math.max(rowHeights[i], size.y);
				} else
					rowspan.height = size.y;
			}
			updateRowSpans(i, rowHeights[i]);
		}
		for (Enumeration enm = rowspans.elements(); enm.hasMoreElements();) {
			RowSpan rowspan = (RowSpan) enm.nextElement();
			int increase = rowspan.getRequiredHeightIncrease();
			if (increase == 0)
				continue;
			TableWrapData td = (TableWrapData) rowspan.child.getLayoutData();
			int ngrowing = 0;
			int[] affectedRows = new int[grid.size()];
			for (int i = 0; i < growingRows.length; i++) {
				int growingRow = growingRows[i];
				if (growingRow >= rowspan.row
						&& growingRow < rowspan.row + td.rowspan) {
					affectedRows[ngrowing++] = growingRow;
				}
			}
			if (ngrowing == 0) {