Backport #29050 by wxiaoguang
Try to improve #28949
1. Make `ctx.Data["ShowOutdatedComments"] = true` by default: it brings
consistent user experience, and sometimes the "outdated (source
changed)" comments are still valuable.
2. Show a friendly message if the comment won't show, then the end users
won't fell that "the comment disappears" (it is the special case when
`ShowOutdatedComments = false`)
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
1. The old `prepareQueryArg` did double-unescaping of form value.
2. By the way, remove the unnecessary `ctx.Flash = ...` in
`MockContext`.
Co-authored-by: Giteabot <teabot@gitea.io>
Just like `models/unittest`, the testing helper functions should be in a
separate package: `contexttest`
And complete the TODO:
> // TODO: move this function to other packages, because it depends on
"models" package
