Incorrect automatic tag correction when reversing a way

[imagic]

The Automatic tag correction suggest wrong tags when reversing ways with the keys ​turn, ​change and ​placement and all their subkeys.

Some Examples:
turn:forward=right

suggested: turn:forward=left correct: turn:backward=right

change:forward=not_right

suggested change:forward=not_left correct: change:backward=not_right

placement:forward=right_of:1

suggested placement:forward=left_of:1 correct: placement:backward=right_of:1

turn:lanes:forward=left|right

suggested: turn:lanes:forward=right|right correct: turn:lanes:backward=left|right

change:lanes:forward=not_right|only_left

suggested: change:lanes:forward=not_right|only_right correct: change:lanes:backward=not_right|only_left

Correct suggestions would be:

• for all the keys change, change:lanes, turn, turn:lanes and placement which are suffixed with :forward or :backward, only change the suffix of the key and don't touch the value
• the keys turn:lanes, change:lanes and placement without any suffix should not be corrected automatically at all

[Don-vip]

In 5787/josm:

fix #8518 - Incorrect automatic tag correction when reversing a way