[GNU/LINUX] Grid snapping and angle snapping not exact digits

[Darkinggq]

Describe the bug
Enabled grid snapping and angle snapping digits is 0.4 sometimes not exact digits 0.39999913 this is a bug

Screenshots/Video

2021-11-04.12-11-37.mp4

2021-11-04.12-12-15.mp4

Found in Branch
stabilization/2110 5a0b631

Desktop/Device (please complete the following information):

• Device: PC
• OS: Xubuntu
• Version: 20.04.03 LTS
• CPU: AMD 3 3100
• GPU: AMD 5500 XT [Mesa 21.0.3]
• Memory: 16GB

[hultonha]

@Magical10240 Thanks for raising this but this technically isn't a bug, this is just a limitation of floating point numbers.

They cannot always represent exact values (e.g. with 0.4, the closest 32 bit representation is is either 0.3999999761581421 or 0.4000000059604645. One option in the Editor would be to have the display round to a smaller number of significant digits, the problem is then you technically hide what's actually happening, so it's a tough call on what the best option is sometimes...

There are some fantastic posts about floating point math here which are worth reading to learn more about the topic - https://randomascii.wordpress.com/2012/01/11/tricks-with-the-floating-point-format/ and https://randomascii.wordpress.com/2012/02/25/comparing-floating-point-numbers-2012-edition/ to name a few).

It might be worth looping in UX to get their take on this, the underlying logic itself though is sound (after having watched the attached videos, thanks again for including them! 👍)