[Patch] Combine ways should merge multivalue tags more intelligently

[bilbo]

It is quite common for some tags (like source) to have multiple values separated by semicolon. However, when you combine ways (by pressing C) and the ways have different tags, the dialog to resolve conflicts will appear.

But for multivalued tags the default suggestion is just blind concatenation of all the values.

So if you have three ways, one with source="bing", second with source="bing;survey", third with source="survey;bing", then if you concatenate them and just press enter in the dialog, you'll end up with combined way with source="bing;bing;survey;survey;bing".

Pretty ugly. JOSM should construct the default value more intelligently, so in these common cases (multiple sources) all the sources wil be present just once in the concatenation, so the default value will be usable and not some concatenated nonsense.

[simon04]

The attached patch should provide this feature. Please test! :-)

[stoecker]

In [4291/josm]:

fix #6254- patch by simon04 - Combine ways should merge multivalue tags more intelligently