Layout export: Support for larger image sizes OR warning/error when over limit

[Binarypasta]

Feature description

I wish for the supported export file size to either be increased, or a functionality for the layout manager to report an error for the two scenarios where i experience it failing - for which i today with the green message "successfully...."

Scenario A) - The image can't be fully drawn: probably due to the resulting file size of image. A (admittable) very large image of 19036x36703 pixels fails to be exported fully, resulting in white sections for the rest of the map. If QGIS is restricted by dependencies for this workflow, i request a integrated feature that discovers and announces this fault - if not warn about it before beginning.

Scenario B) - Layers are not included in the export: While handling a very large set of layers, that really should have been migrated to .gdpk's and reorganized, i recently experienced QGIS drawing the map almost successfully, but must have hit a RAM limitation (not hardware bound, i repeated it with a eye on the RAM usage of 64Gb available). Thus a final layer or two was not included - but again with a green "successfully..." message that led me to expect it to be, as it said, successful

Additional context

Exporting large maps in for this purpose created grids via Atlas is a work-a-round today, but now i'm reaching a point where i create a grid for my projects and end resulting publishing formats - and a grid for each of these grids. Then combining it all in "post-production". But with all these fantastic additions to QGIS that has been coming steadily the last years, i would like to request if it's feasible to increase the export file limitations - or if not, as mention, have a warning system incorporated. Because in later years i've increasingly been working on projects, for which the export size is only getting larger. And i thus do try to export it all in one go, as it would significantly decrease what i mention as "post-production" time.

[mir123]

Same problem here. Need to export a mural-size map at 300 dpi - image size is 50787 x 28700. QGIS reports export finished and PNG is the right size, but content on images reaches a width of 32767 from the left with transparent pixels on the rest of the image. I'm sure the number of pixels of width is not a coincidence. No warnings are given at any point in the process.

No need to export any actual content to get this error -- map with no layers fills background color only to 32767.

Max memory usage for QGIS doing this is 13 GB, still lots of free RAM during the process.

See issue #19198 for reference

QGIS 3.22.4
Linux Mint 21 64-bit
Intel i7-6700 @ 3.4 GHz
32 GB RAM