API unable to paginate on files endpoint

[rlogiacco]

Description

When calling the GET /repos/{owner}/{repo}/pulls/{index}/files endpoint the MAX_RESPONSE_ITEMS config parameter is correctly respected, but also the MAX_GIT_DIFF_FILES config parameter is used and, if exceded, a index out of bounds error occurs.

All acceptable so far, but the pagination is also affected.

For example, with the following:

[git]
MAX_GIT_DIFF_FILES = 100
[api]
MAX_RESPONSE_ITEMS  = 100

With a PR containing 120 files, the first request to the endpoint correctly returns the first 100 items with an header X-HasMore: true. When performing a call to the same endpoint with a page=2 parameter, an error is produced:

...common/middleware.go:71:1() [E] [63ebf818] PANIC: runtime error: index out of range [100] with length 100

I would expect the API endpoint to ignore the MAX_GIT_DIFF_FILES param...

If this is the intended behaviour I suggest to introduce an additional configuration parameter to determine how many files are visbile through the UI.

I've created a test repo and a reference PR: https://try.gitea.io/rlogiacco/api-limit/pulls/1

Gitea Version

1.18.3

Can you reproduce the bug on the Gitea demo site?

Yes

Log Gist

https://gist.github.com/rlogiacco/8a605132a73515f2c9277333a4e27b81

Screenshots

No response

Git Version

2.36.4

Operating System

official docker image

How are you running Gitea?

Inside a docker swarm using a a docker-compose file encompassing a mysql database

Database

MySQL

[sillyguodong]

i am trying to fix it