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	Merge pull request #2493 from andreynering/fix-2489
Refactoring of inline diff computing to prevent empty diff box.
This commit is contained in:
		@@ -51,7 +51,6 @@ type DiffLine struct {
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	RightIdx      int
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	Type          DiffLineType
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	Content       string
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	ParsedContent template.HTML
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}
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func (d *DiffLine) GetType() int {
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@@ -112,42 +111,42 @@ func (diffSection *DiffSection) GetLine(lineType DiffLineType, idx int) *DiffLin
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	return nil
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}
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// computes diff of each diff line and set the HTML on diffLine.ParsedContent
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func (diffSection *DiffSection) ComputeLinesDiff() {
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	for _, diffLine := range diffSection.Lines {
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		var compareDiffLine *DiffLine
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		var diff1, diff2 string
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// computes inline diff for the given line
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func (diffSection *DiffSection) GetComputedInlineDiffFor(diffLine *DiffLine) template.HTML {
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	var compareDiffLine *DiffLine
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	var diff1, diff2 string
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		diffLine.ParsedContent = template.HTML(html.EscapeString(diffLine.Content[1:]))
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		// just compute diff for adds and removes
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		if diffLine.Type != DIFF_LINE_ADD && diffLine.Type != DIFF_LINE_DEL {
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			continue
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		}
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		// try to find equivalent diff line. ignore, otherwise
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		if diffLine.Type == DIFF_LINE_ADD {
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			compareDiffLine = diffSection.GetLine(DIFF_LINE_DEL, diffLine.RightIdx)
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			if compareDiffLine == nil {
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				continue
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			}
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			diff1 = compareDiffLine.Content
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			diff2 = diffLine.Content
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		} else {
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			compareDiffLine = diffSection.GetLine(DIFF_LINE_ADD, diffLine.LeftIdx)
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			if compareDiffLine == nil {
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				continue
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			}
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			diff1 = diffLine.Content
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			diff2 = compareDiffLine.Content
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		}
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		dmp := diffmatchpatch.New()
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		diffRecord := dmp.DiffMain(diff1[1:], diff2[1:], true)
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		diffRecord = dmp.DiffCleanupSemantic(diffRecord)
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		diffLine.ParsedContent = diffToHTML(diffRecord, diffLine.Type)
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	getDefaultReturn := func() template.HTML {
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		return template.HTML(html.EscapeString(diffLine.Content[1:]))
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	}
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	// just compute diff for adds and removes
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	if diffLine.Type != DIFF_LINE_ADD && diffLine.Type != DIFF_LINE_DEL {
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		return getDefaultReturn()
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	}
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	// try to find equivalent diff line. ignore, otherwise
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	if diffLine.Type == DIFF_LINE_ADD {
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		compareDiffLine = diffSection.GetLine(DIFF_LINE_DEL, diffLine.RightIdx)
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		if compareDiffLine == nil {
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			return getDefaultReturn()
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		}
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		diff1 = compareDiffLine.Content
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		diff2 = diffLine.Content
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	} else {
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		compareDiffLine = diffSection.GetLine(DIFF_LINE_ADD, diffLine.LeftIdx)
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		if compareDiffLine == nil {
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			return getDefaultReturn()
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		}
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		diff1 = diffLine.Content
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		diff2 = compareDiffLine.Content
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	}
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	dmp := diffmatchpatch.New()
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	diffRecord := dmp.DiffMain(diff1[1:], diff2[1:], true)
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	diffRecord = dmp.DiffCleanupSemantic(diffRecord)
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	return diffToHTML(diffRecord, diffLine.Type)
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}
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type DiffFile struct {
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@@ -168,12 +168,6 @@ func Diff(ctx *middleware.Context) {
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		}
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	}
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	for _, diffFile := range diff.Files {
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		for _, diffSection := range diffFile.Sections {
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			diffSection.ComputeLinesDiff()
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		}
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	}
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	ctx.Data["IsSplitStyle"] = ctx.Query("style") == "split"
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	ctx.Data["Username"] = userName
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	ctx.Data["Reponame"] = repoName
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@@ -349,12 +349,6 @@ func ViewPullFiles(ctx *middleware.Context) {
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	ctx.Data["Diff"] = diff
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	ctx.Data["DiffNotAvailable"] = diff.NumFiles() == 0
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	for _, diffFile := range diff.Files {
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		for _, diffSection := range diffFile.Sections {
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			diffSection.ComputeLinesDiff()
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		}
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	}
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	commit, err := gitRepo.GetCommit(endCommitID)
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	if err != nil {
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		ctx.Handle(500, "GetCommit", err)
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@@ -76,13 +76,13 @@
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														<span rel="{{if $line.LeftIdx}}diff-{{Sha1 $file.Name}}L{{$line.LeftIdx}}{{end}}">{{if $line.LeftIdx}}{{$line.LeftIdx}}{{end}}</span>
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													</td>
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													<td class="lines-code halfwidth">
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														<pre class="wrap">{{if $line.LeftIdx}}{{$line.ParsedContent}}{{end}}</pre>
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														<pre class="wrap">{{if $line.LeftIdx}}{{$section.GetComputedInlineDiffFor $line}}{{end}}</pre>
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													</td>
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													<td class="lines-num lines-num-new">
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														<span rel="{{if $line.RightIdx}}diff-{{Sha1 $file.Name}}R{{$line.RightIdx}}{{end}}">{{if $line.RightIdx}}{{$line.RightIdx}}{{end}}</span>
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													</td>
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													<td class="lines-code halfwidth">
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														<pre class="wrap">{{if $line.RightIdx}}{{$line.ParsedContent}}{{end}}</pre>
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														<pre class="wrap">{{if $line.RightIdx}}{{$section.GetComputedInlineDiffFor $line}}{{end}}</pre>
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													</td>
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												</tr>
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											{{end}}
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@@ -104,7 +104,7 @@
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													</td>
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													{{end}}
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													<td class="lines-code">
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														<pre>{{$line.ParsedContent}}</pre>
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														<pre>{{$section.GetComputedInlineDiffFor $line}}</pre>
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													</td>
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												</tr>
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											{{end}}
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