Don't draw selection arrows on small objects

[RicoElectrico]

It doesn't make sense to display red segment direction arrows on selected ways that are smaller than arrows themselves. Removing them from objects that are small on the screen would unclutter the view.

[michael2402]

In 12154/josm:

Fix #12926: Don't draw direction arrows on short selection segments.

[Klumbumbus]

Great. However it seems // always draw last arrow - no matter how short the segment is is not working. This is important sometimes when you are zoomed out and want to get an overview about what is where selected.

left: before, right: r12180

Build-Date:2017-05-15 19:03:53
Revision:12180
Is-Local-Build:true

Identification: JOSM/1.5 (12180 SVN de) Windows 10 64-Bit
Memory Usage: 888 MB / 1801 MB (465 MB allocated, but free)
Java version: 1.8.0_131-b11, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Screen: \Display0 1680x1050
Maximum Screen Size: 1680x1050
Dataset consistency test: No problems found

...

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[michael2402]

In 12185/josm:

Fix #12926: Draw the last arrow of the selected object every time

[michael2402]

You are right, for ways this is good to have. I implemented it at first, but then I tested it with buildings and it was sort of annoying there. I don't know a good way of fixing this in a way that works in every case, so I just enabled the last arrow in all cases for now.