Support "Viewed" option in Pull Requests

[VishwasShashidhar]

• Gitea version (or commit ref): 1.8.2
• Git version: N/A
• Operating system: N/A

Description

For Pull Requests that contain a lot of files being changed / added, it helps to have an option (like in GitHub) where in you can mark the file as viewed and review the remaining files in multiple sessions.
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Screenshots

[stale]

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[a1012112796]

ping :)

[6543]

for the Backend Part who notice changes to files, there are 2 TODOs:

• extend checkIfPRContentChanged to return file list
• move AddTestPullRequestTask into queue

revs:
https://github.com/go-gitea/gitea/blob/master/services/pull/pull.go#L233

gitea/services/pull/pull.go

Lines 368 to 378 in a598877

	for diffBeforeLines.Scan() && diffAfterLines.Scan() {
	if strings.HasPrefix(diffBeforeLines.Text(), "index") && strings.HasPrefix(diffAfterLines.Text(), "index") {
	// file hashes can change without the diff changing
	continue
	} else if strings.HasPrefix(diffBeforeLines.Text(), "@@") && strings.HasPrefix(diffAfterLines.Text(), "@@") {
	// the location of the difference may change
	continue
	} else if !bytes.Equal(diffBeforeLines.Bytes(), diffAfterLines.Bytes()) {
	return true, nil
	}
	}