Cache doesn't respect the cache size set in network settings

[pathmapper]

What is the bug or the crash?

In network settings it's possible to set a cache directory and size:

It's expected that the cache size set in network settings accounts for everything in cache directory.

But inside this cache directory (here /home/user/.cache/QGIS/QGIS3) also the http-ranges cache folder is created which is using the same size set in network settings for it's own, so in total the total cache size in the cache directory could be twice as much compared to what is set in settings.

QGIS/src/core/qgstiledownloadmanager.cpp

Lines 200 to 204 in 9195dbd

	cacheDirectory += QLatin1String( "http-ranges" );
	const qint64 cacheSize = settings.value( QStringLiteral( "cache/size" ), 256 * 1024 * 1024 ).toLongLong();
	mRangesCache->setCacheDirectory( cacheDirectory );
	mRangesCache->setCacheSize( cacheSize );

Steps to reproduce the issue

1. Set cache to 10000 KiB
2. use QGIS to populate the normal cache to maximum size. e.g. adding and browsing the standard OSM XYZ-Tiles (cached data is located in data8 folder)
3. to populate the http-ranges folder, load and browse some COPC, e.g.
   https://s3.amazonaws.com/hobu-lidar/sofi.copc.laz

4. inspect the size of the cache folder specified in settings
   -> size is more than what is set in networks settings (>10000 KiB)

Versions

QGIS version	3.35.0-Master	QGIS code revision	0ea61d5
Qt version	5.15.3
Python version	3.10.12
GDAL/OGR version	3.9.0dev-c1783d9d78
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	14.10 (Ubuntu 14.10-0ubuntu0.22.04.1)
SpatiaLite version	5.0.1
QWT version	6.1.4
QScintilla2 version	2.11.6
OS version	Ubuntu 22.04.3 LTS
Active Python plugins
grassprovider	2.12.99
MetaSearch	0.3.6
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

[Gustry]

FYI #58548 in QGIS 3.40