Inspector: Make default float step configurable

Also allow lifting the decimal step formatting with a hint range step
of 0. A new `range_step_decimals()` is added for this to avoid breaking
compatibility on the general purpose `step_decimals()` (which still
returns 0 for an input step of 0).

Supersedes #25470.
Partial fix for #18251.

2 files changed, 10 insertions, 0 deletions

diff --git a/core/math/math_funcs.cpp b/core/math/math_funcs.cpp
index 7a2e74a413..f04e40cb6c 100644
--- a/core/math/math_funcs.cpp
+++ b/core/math/math_funcs.cpp
@@ -79,6 +79,15 @@ int Math::step_decimals(double p_step) {
 	return 0;
 }
 
+// Only meant for editor usage in float ranges, where a step of 0
+// means that decimal digits should not be limited in String::num.
+int Math::range_step_decimals(double p_step) {
+	if (p_step < 0.0000000000001) {
+		return 16; // Max value hardcoded in String::num
+	}
+	return step_decimals(p_step);
+}
+
 double Math::dectime(double p_value, double p_amount, double p_step) {
 	double sgn = p_value < 0 ? -1.0 : 1.0;
 	double val = Math::abs(p_value);
diff --git a/core/math/math_funcs.h b/core/math/math_funcs.h
index b8b5151802..a712356ddc 100644
--- a/core/math/math_funcs.h
+++ b/core/math/math_funcs.h
@@ -270,6 +270,7 @@ public:
 	// double only, as these functions are mainly used by the editor and not performance-critical,
 	static double ease(double p_x, double p_c);
 	static int step_decimals(double p_step);
+	static int range_step_decimals(double p_step);
 	static double stepify(double p_value, double p_step);
 	static double dectime(double p_value, double p_amount, double p_step);