increase default maximum size of thumbnailed images

[matkoniecz]

fixes #2024

note: if it is not autogenerated then docs also need to be manually changed, see https://github.com/search?q=repo%3Alxqt%2Fpcmanfm-qt+4+image+size+limit&type=code&p=3

[matkoniecz]

I considered bumping it to 400 MB but not sure about potential performance problems

If thumbnailer explodes at processing 20MB photos then it is a thumbnailer bug. Though if it explodes at 350MB files it would be more reasonable (as of 2025).

Likely this limit should be bumped again in a few years. Maybe should be higher already.

[matkoniecz]

note: this PR is untested

I can try testing it if it will not be flat-out rejected

[tsujan]

→ #2024 (comment)

[matkoniecz]

→ #2024 (comment)

[Chiitoo]

I think the default should stay relatively low, because for one, the space consumed could very much explode without the user realising it.

I'm one of those who does his best with disabling the creation of these files on all the applications I use. : ]

Also as mentioned elsewhere, distributions can change these defaults during packaging, though I think that might also
be unlikely to happen (saying that as one such packager).