Flaky: TextFieldStateRenderTest remembered-state write drew 0 changed pixels once #87

On develop 26485a0 TextFieldStateRenderTest.aRememberedStateIsDrawnAndAWriteFromPythonShowsOnTheNextFrame failed once (ink 15678 -> 15678 px, 0 pixels differ) although the Python asserts showed the state held the new text; the same test passed on its branch (114/0), on #74's branch after merge (115/0), and on a rerun of develop (930 pixels differ after 1 frame). Completion: the test renders up to 4 frames after the write (assertion unchanged), and stays green.