Color-code the object history viewer

[naoliv]

When viewing some object history every change is always red:

Could it be color-coded to differentiate it when:

• key/value has been added: green
• value has been modified: yellow
• key/value has been removed: red

JOSM:

URL:http://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2015-12-13 01:12:02 +0100 (Sun, 13 Dec 2015)
Build-Date:2015-12-13 02:33:51
Revision:9106
Relative:URL: ^/trunk

Identification: JOSM/1.5 (9106 pt_BR) Linux Debian GNU/Linux unstable (sid)
Memory Usage: 1093 MB / 3641 MB (582 MB allocated, but free)
Java version: 1.8.0_72-internal, Oracle Corporation, OpenJDK 64-Bit Server VM
VM arguments: [-Dawt.useSystemAAFontSettings=on]
Dataset consistency test: No problems found

Plugins:
- AddrInterpolation (31772)
- Create_grid_of_ways (31772)
- FastDraw (31772)
- FixAddresses (31772)
- OpeningHoursEditor (31772)
- PicLayer (31772)
- SimplifyArea (31772)
- apache-commons (31772)
- buildings_tools (31772)
- download_along (31772)
- editgpx (31772)
- ejml (31772)
- geotools (31774)
- graphview (31772)
- jts (31772)
- log4j (31772)
- measurement (31772)
- merge-overlap (31772)
- opendata (31772)
- pdfimport (31772)
- photo_geotagging (31772)
- poly (31772)
- reverter (31772)
- tagging-preset-tester (31772)
- todo (29154)
- turnrestrictions (31772)
- undelete (31772)
- utilsplugin2 (31772)

[simon04]

In 9194/josm:

fix #12191 - Color-code the tag history table

[simon04]

History of w363395230:

[Klumbumbus]

Great, thanks!

[stoecker]

Small optimization: For changed values I'd only color the key or the value and not also the unmodified part. Otherwise it may be hard e.g. to detect space changes.

[stoecker]

In 9450/josm:

see #12191, only color code the changed part - possible improvement: with a bit more logic changed keys with unchanged values could be detected and added into one line instead of a replace/add pair (e.g. key-typo fixes)