ENH: positioner row widget sizing usability fixes and tweaks #240

Job	Run time
standard / Documentation / Python 3.9: documentation building	1m 11s
standard / pre-commit checks / pre-commit	16s
standard / Conda (3.11, true) / Python 3.11: conda	6m 49s
standard / Conda (3.12, true) / Python 3.12: conda	6m 38s
standard / Conda (3.10) / Python 3.10: conda	6m 55s
standard / Conda (3.9, true) / Python 3.9: conda	6m 52s
standard / Pip (3.11, true) / Python 3.11: pip	5m 10s
standard / Pip (3.10) / Python 3.10: pip	5m 3s
standard / Pip (3.12, true) / Python 3.12: pip	5m 15s
standard / Pip (3.9, true) / Python 3.9: pip	5m 2s
standard / Documentation / Documentation deployment	0s
	49m 11s

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