ENH: positioner row widget sizing usability fixes and tweaks #243

Job	Run time
standard / Documentation / Python 3.9: documentation building	1m 13s
standard / pre-commit checks / pre-commit	24s
standard / Conda (3.10) / Python 3.10: conda	6m 53s
standard / Conda (3.11, true) / Python 3.11: conda	6m 53s
standard / Conda (3.12, true) / Python 3.12: conda	6m 50s
standard / Conda (3.9, true) / Python 3.9: conda	7m 1s
standard / Pip (3.10) / Python 3.10: pip	5m 9s
standard / Pip (3.11, true) / Python 3.11: pip	4m 53s
standard / Pip (3.9, true) / Python 3.9: pip	5m 16s
standard / Pip (3.12, true) / Python 3.12: pip	5m 53s
standard / Documentation / Documentation deployment	0s
	50m 25s

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