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Fix broken code editor diff preview (#23307)

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Close #23265, the code editor diff preview has been broken for long
time.

* Fix the regression for `data-line-num`
    * `.code-diff` is necessary to show the line number
* Fix the regression for #12434
* The diff:
[12434](https://github.com/go-gitea/gitea/pull/12434/files?diff=unified&w=1)
    * It hides the Type(4) (aka HunkHeader)  for unexpected cases.


Diff with ignoring whitespaces:
https://github.com/go-gitea/gitea/pull/23307/files?diff=unified&w=1

Before: see the issue #23265

After:

![image](https://user-images.githubusercontent.com/2114189/222942810-286dc9af-0b39-4e9d-8585-8c299b881241.png)
This commit is contained in:
wxiaoguang 2023-03-06 09:37:58 +08:00 • committed by GitHub
parent ce43208c6a
commit 6886706f5a
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3 changed files with 35 additions and 32 deletions
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2
services/gitdiff/gitdiff.go
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@ -474,7 +474,7 @@ func ParsePatch(maxLines, maxLineCharacters, maxFiles int, reader io.Reader, ski
sb := strings.Builder{}
// OK let's set a reasonable buffer size.
// This should be let's say at least the size of maxLineCharacters or 4096 whichever is larger.
// This should be at least the size of maxLineCharacters or 4096 whichever is larger.
readerSize := maxLineCharacters
if readerSize < 4096 {
readerSize = 4096