add test for wrong clientHeight #4965
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Small test case for inner height regression, ie clientHeight should be identical to scrollHeight on pads with few lines, but should be less than scrollHeight on pads with lots of lines.
This is useful as a guard against a regression where scrolling, line number links (and maybe other things that depend on getInnerHeight or
clientHeight) stopped working. The solution to this problem was cb9f6d6See #4954 (comment) for details why this test should be extended to check if the editor "has grown" when the number of pad lines reach below the viewport area and why I struggled implementing it.