Model designer export as/run as python didn't catch newline in algorithm comments

[WhitespaceQ]

What is the bug or the crash?

When using model designer to export a model as a python script, if there is any algorithm that have a multi-line comment in Algorithm -> Comment the script won't work because the exporter fails to properly catch newline in the comment and will only commented out the first line only. This will throw a python SyntaxError.

Python script error:

An error has occurred while executing Python code: 

SyntaxError: invalid syntax 
Traceback (most recent call last):
  File "C:\PROGRA~1/QGIS32~1.11/apps/qgis-ltr/./python/plugins\processing\script\ScriptAlgorithmProvider.py", line 121, in loadAlgorithms
    alg = ScriptUtils.loadAlgorithm(moduleName, filePath)
  File "C:\PROGRA~1/QGIS32~1.11/apps/qgis-ltr/./python/plugins\processing\script\ScriptUtils.py", line 67, in loadAlgorithm
    spec.loader.exec_module(module)
  File "", line 851, in exec_module
  File "", line 988, in get_code
  File "", line 918, in source_to_code
  File "", line 228, in _call_with_frames_removed
  File "C:\Users\Asus\AppData\Roaming\QGIS\QGIS3\profiles\default\processing\scripts\EXPORTED_MODEL.py", line 32
    Uncommented newline
        ^
SyntaxError: invalid syntax


Python version: 3.9.5 (tags/v3.9.5:0a7dcbd, May  3 2021, 17:27:52) [MSC v.1928 64 bit (AMD64)] 
QGIS version: 3.22.11-Białowieża Białowieża, 106d33d7 

Steps to reproduce the issue

1. Create a simple model with one input and one algorithm
2. Add a multi-line comment in the algorithm --> comment tab
3. Export the model as a python script
4. Try to run the exported script

    def processAlgorithm(self, parameters, context, model_feedback):
        # Use a multi-step feedback, so that individual child algorithm progress reports are adjusted for the
        # overall progress through the model
        feedback = QgsProcessingMultiStepFeedback(1, model_feedback)
        results = {}
        outputs = {}

        # Points along geometry
        # This is a comment in line one
This is a comment in line two
        alg_params = {
            'DISTANCE': 1,
            'END_OFFSET': 0,
            'INPUT': parameters['test'],
            'START_OFFSET': 0,
            'OUTPUT': QgsProcessing.TEMPORARY_OUTPUT
        }

This behavior also occurs in model input comment

        self.addParameter(QgsProcessingParameterField('omit', 'OMITb', type=QgsProcessingParameterField.Any, parentLayerParameterName='before', allowMultiple=False, defaultValue=None))
        # This is a comment in line one
This is a comment in line two

Versions

QGIS version | 3.22.11-Białowieża | QGIS code revision | 106d33d7
-- | -- | -- | --
Qt version | 5.15.3
Python version | 3.9.5
GDAL/OGR version | 3.5.1
PROJ version | 9.1.0
EPSG Registry database version | v10.074 (2022-08-01)
GEOS version | 3.10.3-CAPI-1.16.1
SQLite version | 3.38.1
PDAL version | 2.4.3
PostgreSQL client version | 14.3
SpatiaLite version | 5.0.1
QWT version | 6.1.6
QScintilla2 version | 2.13.1
OS version | Windows 10 Version 2009
  |   |   |  
Active Python plugins
autoSaver | 2.6
batchvectorlayersaver | 0.9
CalculateGeometry | 0.6.8
FreehandRasterGeoreferencer | 0.8.3
latlontools | 3.6.6
profiletool | 4.2.2
qgsAzimuth | 0.9.15
QuickOSM | 2.1.1
quick_map_services | 0.19.29
SRTM-Downloader | 3.1.17
db_manager | 0.1.20
MetaSearch | 0.3.5
processing | 2.12.99
sagaprovider | 2.12.99

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

The script can be fixed by manually finding uncommented line in the exported script.