ST_RemoveRepeatedPoints returned geometry bbox might be incorrect

[Algunenano]

When the tolerance is > 0, the resulting geometry bbox might change but it isn't updated:

Example:

# WITH geom AS
(
    SELECT ST_RemoveRepeatedPoints('POLYGON((0 0, 10 0, 10 10, 10.5 10.5, 10 10, 0 10, 0 0))', 1) as g
)
Select ST_AsText(g) as geometry, postgis_getbbox(g) AS box from geom;
              geometry              |        box         
------------------------------------+--------------------
 POLYGON((0 0,10 0,10 10,0 10,0 0)) | BOX(0 0,10.5 10.5)
(1 row)

Time: 0.635 ms

[strk]

Wait, how do removing _repeated_ points can change the bounding box ? I'd think if bounding box changes then something _more_ than _repeated_ points have been removed, which would be a bug

[Algunenano]

Wait, how do removing _repeated_ points can change the bounding box ?

Because it has a tolerance value, so different points might be removed.

[strk]

Ah right, with tolereance value, yep. So this bug entered codebase in 2.2, if you want to backport the fix till there. Reference: #1137

[algunenano]

In 17793:

Fix ST_RemoveRepeatedPoints output having an outdated bbox

References #4493
Closes ​https://github.com/postgis/postgis/pull/472

[algunenano]

In 17794:

Fix ST_RemoveRepeatedPoints output having an outdated bbox

References #4493

[algunenano]

In 17795:

Fix ST_RemoveRepeatedPoints output having an outdated bbox

References #4493

[algunenano]

In 17796:

Fix ST_RemoveRepeatedPoints output having an outdated bbox

Closes #4493