Round up in GeoCoordinateFormatter when close to a degree/minute

[thiemowmde]

I'm introducing a delta here.

• In the degree-minute format the minute is not shown (but rounded up to degree) when the precision is almost 1 degree, just 1 minute lower.
• In the degree-minute-second format the second is not shown (but rounded up to minute) when the precision is almost 1 minute, just 1 second lower.

This compensates for all kinds of rounding errors that can happen when the precision is calculated externally.

I consider this a bugfix because it changes the output of the formatter to be much closer to the users expectation. When the precision is 0.999° it is very surprising to get 1°59'. This makes it look like the precision is 1 second, when in reality it is almost exactly 1 minute.

I was playing around with different thresholds. Note that 30 seconds is a bad threshold. It appears like this will create a situation where the distance to 1 minute is the same as the distance to 1 second. In reality the threshold represents 0.5 minutes, but 30 seconds (2 vs. 30 times).

A perfect threshold would be the square root of 60 = 7.746 seconds, but that would be confusing for users. 10 seconds (represents an actual digit in the output format) would be to much. Something like 5 or 2 seconds would be ok but still be confusing. So I decided to go for 1.

Bug: T158772

[JeroenDeDauw]

+1

[thiemowmde]

With #95 this patch became a lot simpler. Yay!