Allow point inputs in "Filter vertices by M/Z values" algorithms

[alexbruy]

Description

Processing algorithms "Filter vertices by M/Z values" does not accept point layers as input, while "Extract specific vertices" algorithm can be applied to points as well (e.g. to extract some points from multipoint geometry). This is a bit inconsistent behaviour. This PR allows "Filter vertices by M/Z values" to accept point layers to make it uniform with "Extract specific vertices" algorithm.

Fixes #33502.

[github-actions]

🪟 Windows builds ready!

Windows builds of this PR are available for testing here. Debug symbols for this build are available here.

(Built from commit e5c6b7b)

[lbartoletti]

Nice! If you can add test, it can be good, but it's not a block for me.

[alexbruy]

If you can add test, it can be good, but it's not a block for me.

We already have tests for this algorithm using line input. Do you think it makes sense to have identical tests with polygons and points?

[lbartoletti]

If you can add test, it can be good, but it's not a block for me.

We already have tests for this algorithm using line input. Do you think it makes sense to have identical tests with polygons and points?

It can prevent future error/regression/whatyouwant ; but it's up to you

[qgis-bot]

@alexbruy
This pull request has been tagged as requiring documentation.

A documentation ticket will be opened at https://github.com/qgis/QGIS-Documentation when this PR is merged.

Please update the description (not the comments) with helpful description and screenshot to help the work from documentors.
Also, any commit having [needs-doc] or [Needs Documentation] in will see its message pushed to the issue, so please be as verbose as you can.

Thank you!

[agiudiceandrea]

Hi @alexbruy, it seems to me that while the "Filter vertices by M/Z values" algorithms can now have a point vector layer as input, they don't work with single-part point vector layer.

See for example the following layers that are identical (apart from the geometry type) and contain 5 features with 1 point each and the Z coordinate ranging from 10 to 50

PointZ.zip
MultiPointZ.zip

Executing the "Filter vertices by Z values" with the minimum value parameter set to 30, then the resulting output layer correctly contains 3 features with point's Z coordinate ranging from 30 to 50 if the input layer is the "MultiPointZ" layer, while it incorrectly contains all the 5 input features if the input layer is the "PointZ" layer.

Is it expected?