Meassurement charts rounding

[eyJhb]

Steps to Reproduce

1. Add two weigh in e.g. 79.4 and 79.1
2. Refresh chart
3. Hopefully see rounding error?

Expected results:
I would expect it to not write 79.39999999999999, and instead just do 79.40.

Actual results:

** Other **
I'm unsure if any of the improvements in #657 could cause it, or if it's just a preexisting thing.

[rolandgeider]

yes, that is definitely a bit too much precision

[rolandgeider]

mhhh, could not reproduce this, even with other "weird" numbers

[eyJhb]

I could reproduce it even on the latest master branch w/ Flutter desktop. I think the issue occurs, if the weight measurements are within the same whole number, but just different decimals. I reproduced it on wger.de, using the latest master branch.

I've made a user you can test on on wger.de
Username: issue-695@wger.de
Password: same as username

:)

[rolandgeider]

weird that this only seemed to trigger with some numbers. But in any case this is fixed now 😎

[Dieterbe]

weird that this only seemed to trigger with some numbers

my guess is that the charting library uses doubles with one decimal over a long range, and many more decimals on a short range, so it just "happened to work" with the standard printing behavior, before.

thanks for the report and the fix!