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Backport PRmatplotlib#30162: TST: Fix runtime error checking NaN input to format_cursor_data

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Lines changed: 4 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -2208,6 +2208,9 @@ def _g_sig_digits(value, delta):`
`2208`	`2208`	`Return the number of significant digits to %g-format value, assuming that`
`2209`	`2209`	`it is known with an error of delta.`
`2210`	`2210`	`"""`
	`2211`	`+# For inf or nan, the precision doesn't matter.`
	`2212`	`+ifnotmath.isfinite(value):`
	`2213`	`+return0`
`2211`	`2214`	`ifdelta==0:`
`2212`	`2215`	`ifvalue==0:`
`2213`	`2216`	`# if both value and delta are 0, np.spacing below returns 5e-324`
`@@ -2221,11 +2224,10 @@ def _g_sig_digits(value, delta):`
`2221`	`2224`	`# digits before the decimal point (floor(log10(45.67)) + 1 = 2): the total`
`2222`	`2225`	`# is 4 significant digits. A value of 0 contributes 1 "digit" before the`
`2223`	`2226`	`# decimal point.`
`2224`		`-# For inf or nan, the precision doesn't matter.`
`2225`	`2227`	`returnmax(`
`2226`	`2228`	`0,`
`2227`	`2229`	`(math.floor(math.log10(abs(value)))+1ifvalueelse1)`
`2228`		`--math.floor(math.log10(delta)))ifmath.isfinite(value)else0`
	`2230`	`+-math.floor(math.log10(delta)))`
`2229`	`2231`
`2230`	`2232`
`2231`	`2233`	`def_unikey_or_keysym_to_mplkey(unikey,keysym):`

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