Elevation profile - Map units are not properly supported in point markers

[andreasneumann]

What is the bug or the crash?

When defining point symbols on line geometries for the profile view the map units are not respected and they act very strangely in the marker preview when selected and combined with anchor points.

In the interactive profile, the map units are not respected. I would expect that when I zoom in into the profile that the point SVG symbols would also be displayer larger because of the map units.

Steps to reproduce the issue

1. Load any 3D line layer
2. In the elevation tab define a marker with map units on the marker symbols
3. Zoom in and out in the profile and notice that the symbol is displayed with the same size always, regardless of the map units definition

For symbols that have a certain size in m in reality it would be really nice if the map units would work properly in the profile view.

Versions

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QGIS version	3.31.0-Master	QGIS code revision	0ce567b
Qt version	5.15.3
Python version	3.10.6
GDAL/OGR version	3.4.1
PROJ version	8.2.1
EPSG Registry database version	v10.041 (2021-12-03)
GEOS version	3.10.2-CAPI-1.16.0
SQLite version	3.37.2
PDAL version	2.3.0
PostgreSQL client version	unknown
SpatiaLite version	5.0.1
QWT version	6.1.4
QScintilla2 version	2.11.6
OS version	Ubuntu 22.04.2 LTS
Active Python plugins
changeDataSource	3.1
solocator	1.6.0
pg_raster_import	3.2.0
trackable_project_files	v1.2.2
linking_relation_editor	v1.1.9
QgisModelBaker	v7.5.0
AtlasExportFunction	1.1
processing	2.12.99
db_manager	0.1.20

QGIS version 3.31.0-Master QGIS code revision [0ce567b](https://github.com/qgis/QGIS/commit/0ce567bd306) Qt version 5.15.3 Python version 3.10.6 GDAL/OGR version 3.4.1 PROJ version 8.2.1 EPSG Registry database version v10.041 (2021-12-03) GEOS version 3.10.2-CAPI-1.16.0 SQLite version 3.37.2 PDAL version 2.3.0 PostgreSQL client version unknown SpatiaLite version 5.0.1 QWT version 6.1.4 QScintilla2 version 2.11.6 OS version Ubuntu 22.04.2 LTS

Active Python plugins
changeDataSource
3.1
solocator
1.6.0
pg_raster_import
3.2.0
trackable_project_files
v1.2.2
linking_relation_editor
v1.1.9
QgisModelBaker
v7.5.0
AtlasExportFunction
1.1
processing
2.12.99
db_manager
0.1.20

Supported QGIS version

• I'm running a supported QGIS version according to the roadmap.

New profile

• I tried with a new QGIS profile

Additional context

No response