Wrong Dateline wrapping on extents that cross the dateline

[tbonfort]

Setup:

• issue a getmap request for a projected SRS, with an extent that crosses the dateline, e.g. -21000000,-21000000,21000000,21000000
• use a mapfile with a layer who's data is stored in lonlat

Expected:

• MapServer uses a searchrect for querying the layer data, that ressembles -181,-90,181,90 or -180,-90,180,90

Issue:

• The searchrect created looks like the red polygon from https://gist.github.com/tbonfort/9779573 which is obviously creating incorrect results. The resulting polygon after this patch is colored in blue.

[rouault]

@tbonfort Are you sure about your change in msProjectShapeLine ? The original code was consistant with the use of msTestNeedWrap() done in msProjectLine(), i.e. that we compare the current point with the first point of the line. In which situation does it makes things better to compare to previous point rather than to first point ? Perhaps if we have a polygon with a nearly world extent but that does not cross the antimeridian, and whose point density is sufficiently high so that 2 consecutive points don't have an abs difference of longitude > 180 ?