[PATCH] Area joining fails with special setup

[stoecker]

When joining the two ways 24925550 and 23333420 the tool to join areas forgets one line.

[xeen]

The patch fixes the following:

• Undo/Redo action description wasn't really translatable due to area names being included in the String.
• Prevents duplicates when searching for inner ways
• Fixed the issue here by explicitly working around it (normally the missing piece should be combined with the outer way, but since this only happens for two-node ways and since it's hard to find those "useful" two-nodes ways, it simply connects first and last node of the outer way which achieves the same).
• Adds more checks for uninteresting/wrong ways when fixing multipolygons (it sometimes broke the testcase in the lower middle).
• Made makeCommitsOneAction not produce an error if for some reason the action count is longer than the undo buffer.

[stoecker]

in ​[o14356].