Make diff line-marker non-selectable (#7279)

* Make diff line-marker non-selectable
* Move to use data-* as per @mrsdizzie
* fix missing line nums
* Add a minimum-width to force right-align of the line num
* Move line-type-marker into separate column

models/git_diff.go

 	return d.Comments[0].DiffSide()
 }
 
+// GetLineTypeMarker returns the line type marker
+func (d *DiffLine) GetLineTypeMarker() string {
+	if strings.IndexByte(" +-", d.Content[0]) > -1 {
+		return d.Content[0:1]
+	}
+	return ""
+}
+
 // DiffSection represents a section of a DiffFile.
 type DiffSection struct {
 	Name  string
 }
 
 var (
-	addedCodePrefix   = []byte("<span class=\"added-code\">")
-	removedCodePrefix = []byte("<span class=\"removed-code\">")
-	codeTagSuffix     = []byte("</span>")
+	addedCodePrefix   = []byte(`<span class="added-code">`)
+	removedCodePrefix = []byte(`<span class="removed-code">`)
+	codeTagSuffix     = []byte(`</span>`)
 )
 
 func diffToHTML(diffs []diffmatchpatch.Diff, lineType DiffLineType) template.HTML {
 	buf := bytes.NewBuffer(nil)
 
-	// Reproduce signs which are cut for inline diff before.
-	switch lineType {
-	case DiffLineAdd:
-		buf.WriteByte('+')
-	case DiffLineDel:
-		buf.WriteByte('-')
-	}
-
 	for i := range diffs {
 		switch {
 		case diffs[i].Type == diffmatchpatch.DiffInsert && lineType == DiffLineAdd:
 	case DiffLineAdd:
 		compareDiffLine = diffSection.GetLine(DiffLineDel, diffLine.RightIdx)
 		if compareDiffLine == nil {
-			return template.HTML(html.EscapeString(diffLine.Content))
+			return template.HTML(html.EscapeString(diffLine.Content[1:]))
 		}
 		diff1 = compareDiffLine.Content
 		diff2 = diffLine.Content
 	case DiffLineDel:
 		compareDiffLine = diffSection.GetLine(DiffLineAdd, diffLine.LeftIdx)
 		if compareDiffLine == nil {
-			return template.HTML(html.EscapeString(diffLine.Content))
+			return template.HTML(html.EscapeString(diffLine.Content[1:]))
 		}
 		diff1 = diffLine.Content
 		diff2 = compareDiffLine.Content
 	default:
+		if strings.IndexByte(" +-", diffLine.Content[0]) > -1 {
+			return template.HTML(html.EscapeString(diffLine.Content[1:]))
+		}
 		return template.HTML(html.EscapeString(diffLine.Content))
 	}
 

models/git_diff_test.go

 }
 
 func TestDiffToHTML(t *testing.T) {
-	assertEqual(t, "+foo <span class=\"added-code\">bar</span> biz", diffToHTML([]dmp.Diff{
+	assertEqual(t, "foo <span class=\"added-code\">bar</span> biz", diffToHTML([]dmp.Diff{
 		{Type: dmp.DiffEqual, Text: "foo "},
 		{Type: dmp.DiffInsert, Text: "bar"},
 		{Type: dmp.DiffDelete, Text: " baz"},
 		{Type: dmp.DiffEqual, Text: " biz"},
 	}, DiffLineAdd))
 
-	assertEqual(t, "-foo <span class=\"removed-code\">bar</span> biz", diffToHTML([]dmp.Diff{
+	assertEqual(t, "foo <span class=\"removed-code\">bar</span> biz", diffToHTML([]dmp.Diff{
 		{Type: dmp.DiffEqual, Text: "foo "},
 		{Type: dmp.DiffDelete, Text: "bar"},
 		{Type: dmp.DiffInsert, Text: " baz"},

public/css/index.css

 .repository .diff-box .header .file{flex:1;color:#888;word-break:break-all}
 .repository .diff-box .header .button{margin:-5px 0 -5px 12px;padding:8px 10px;flex:0 0 auto}
 .repository .diff-file-box .header{background-color:#f7f7f7}
-.repository .diff-file-box .file-body.file-code .lines-num{text-align:right;color:#a6a6a6;background:#fafafa;width:1%;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;vertical-align:top}
+.repository .diff-file-box .file-body.file-code .lines-num{text-align:right;color:#a6a6a6;background:#fafafa;width:1%;min-width:50px;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;vertical-align:top}
 .repository .diff-file-box .file-body.file-code .lines-num span.fold{display:block;text-align:center}
 .repository .diff-file-box .file-body.file-code .lines-num-old{border-right:1px solid #ddd}
 .repository .diff-file-box .code-diff{font-size:12px}
 .repository .diff-file-box .code-diff tbody tr td.tag-code,.repository .diff-file-box .code-diff tbody tr.tag-code td{background-color:#f0f0f0!important;border-color:#d3cfcf!important;padding-top:8px;padding-bottom:8px}
 .repository .diff-file-box .code-diff tbody tr .removed-code{background-color:#f99}
 .repository .diff-file-box .code-diff tbody tr .added-code{background-color:#9f9}
+.repository .diff-file-box .code-diff tbody tr .lines-num[data-line-num]::before{content:attr(data-line-num);text-align:right}
+.repository .diff-file-box .code-diff tbody tr .lines-type-marker{width:10px;min-width:10px}
+.repository .diff-file-box .code-diff tbody tr .line-type-marker[data-type-marker]::before{content:attr(data-type-marker);text-align:right;display:inline-block}
 .repository .diff-file-box .code-diff-unified tbody tr.del-code td{background-color:#ffe0e0!important;border-color:#f1c0c0!important}
 .repository .diff-file-box .code-diff-unified tbody tr.add-code td{background-color:#d6fcd6!important;border-color:#c1e9c1!important}
 .repository .diff-file-box .code-diff-split table,.repository .diff-file-box .code-diff-split tbody{width:100%}
-.repository .diff-file-box .code-diff-split tbody tr.add-code td:nth-child(1),.repository .diff-file-box .code-diff-split tbody tr.add-code td:nth-child(2),.repository .diff-file-box .code-diff-split tbody tr.del-code td:nth-child(3),.repository .diff-file-box .code-diff-split tbody tr.del-code td:nth-child(4){background-color:#fafafa}
-.repository .diff-file-box .code-diff-split tbody tr td.del-code,.repository .diff-file-box .code-diff-split tbody tr.del-code td:nth-child(1),.repository .diff-file-box .code-diff-split tbody tr.del-code td:nth-child(2){background-color:#ffe0e0!important;border-color:#f1c0c0!important}
-.repository .diff-file-box .code-diff-split tbody tr td.add-code,.repository .diff-file-box .code-diff-split tbody tr.add-code td:nth-child(3),.repository .diff-file-box .code-diff-split tbody tr.add-code td:nth-child(4){background-color:#d6fcd6!important;border-color:#c1e9c1!important}
-.repository .diff-file-box .code-diff-split tbody tr td:nth-child(3){border-left-width:1px;border-left-style:solid}
+.repository .diff-file-box .code-diff-split tbody tr.add-code td:nth-child(1),.repository .diff-file-box .code-diff-split tbody tr.add-code td:nth-child(2),.repository .diff-file-box .code-diff-split tbody tr.del-code td:nth-child(3),.repository .diff-file-box .code-diff-split tbody tr.del-code td:nth-child(4),.repository .diff-file-box .code-diff-split tbody tr.del-code td:nth-child(5),.repository .diff-file-box .code-diff-split tbody tr.del-code td:nth-child(6){background-color:#fafafa}
+.repository .diff-file-box .code-diff-split tbody tr td.del-code,.repository .diff-file-box .code-diff-split tbody tr.del-code td:nth-child(1),.repository .diff-file-box .code-diff-split tbody tr.del-code td:nth-child(2),.repository .diff-file-box .code-diff-split tbody tr.del-code td:nth-child(3){background-color:#ffe0e0!important;border-color:#f1c0c0!important}
+.repository .diff-file-box .code-diff-split tbody tr td.add-code,.repository .diff-file-box .code-diff-split tbody tr.add-code td:nth-child(4),.repository .diff-file-box .code-diff-split tbody tr.add-code td:nth-child(5),.repository .diff-file-box .code-diff-split tbody tr.add-code td:nth-child(6){background-color:#d6fcd6!important;border-color:#c1e9c1!important}
+.repository .diff-file-box .code-diff-split tbody tr td:nth-child(4){border-left-width:1px;border-left-style:solid}
 .repository .diff-file-box.file-content{clear:right}
 .repository .diff-file-box.file-content img{max-width:100%;padding:5px 5px 0 5px}
 .repository .code-view{overflow:auto;overflow-x:auto;overflow-y:hidden}

public/less/_repository.less

                 color: #a6a6a6;
                 background: #fafafa;
                 width: 1%;
+                min-width: 50px;
                 user-select: none;
                 vertical-align: top;
 
                     .added-code {
                         background-color: #99ff99;
                     }
+
+                    .lines-num[data-line-num]::before {
+                        content: attr(data-line-num);
+                        text-align: right;
+                    }
+
+                    .lines-type-marker {
+                        width: 10px;
+                        min-width: 10px;
+                    }
+
+                    .line-type-marker[data-type-marker]::before {
+                        content: attr(data-type-marker);
+                        text-align: right;
+                        display: inline-block;
+                    }
                 }
             }
         }
                 &.add-code td:nth-child(1),
                 &.add-code td:nth-child(2),
                 &.del-code td:nth-child(3),
-                &.del-code td:nth-child(4) {
+                &.del-code td:nth-child(4),
+                &.del-code td:nth-child(5),
+                &.del-code td:nth-child(6) {
                     background-color: #fafafa;
                 }
 
                 &.del-code td:nth-child(1),
                 &.del-code td:nth-child(2),
+                &.del-code td:nth-child(3),
                 td.del-code {
                     background-color: #ffe0e0 !important;
                     border-color: #f1c0c0 !important;
                 }
 
-                &.add-code td:nth-child(3),
                 &.add-code td:nth-child(4),
+                &.add-code td:nth-child(5),
+                &.add-code td:nth-child(6),
                 td.add-code {
                     background-color: #d6fcd6 !important;
                     border-color: #c1e9c1 !important;
                 }
 
-                td:nth-child(3) {
+                td:nth-child(4) {
                     border-left-width: 1px;
                     border-left-style: solid;
                 }

templates/repo/diff/box.tmpl

 											{{range $j, $section := $file.Sections}}
 												{{range $k, $line := $section.Lines}}
 													<tr class="{{DiffLineTypeToStr .GetType}}-code nl-{{$k}} ol-{{$k}}">
-														<td class="lines-num lines-num-old">
-															<span rel="{{if $line.LeftIdx}}diff-{{Sha1 $file.Name}}L{{$line.LeftIdx}}{{end}}">{{if $line.LeftIdx}}{{$line.LeftIdx}}{{end}}</span>
+														<td class="lines-num lines-num-old" data-line-num="{{if $line.LeftIdx}}{{$line.LeftIdx}}{{end}}">
+															<span rel="{{if $line.LeftIdx}}diff-{{Sha1 $file.Name}}L{{$line.LeftIdx}}{{end}}"></span>
+														</td>
+														<td class="lines-type-marker">
+															<pre>{{if $line.LeftIdx}}<span class="line-type-marker" data-type-marker="{{$line.GetLineTypeMarker}}"></span>{{end}}</pre>
 														</td>
 														<td class="lines-code lines-code-old halfwidth">
 															{{if and $.SignedUserID $line.CanComment $.PageIsPullFiles (not (eq .GetType 2))}}
 															{{end}}
 															<pre><code class="wrap {{if $highlightClass}}language-{{$highlightClass}}{{else}}nohighlight{{end}}">{{if $line.LeftIdx}}{{$section.GetComputedInlineDiffFor $line}}{{end}}</code></pre>
 														</td>
-														<td class="lines-num lines-num-new">
-															<span rel="{{if $line.RightIdx}}diff-{{Sha1 $file.Name}}R{{$line.RightIdx}}{{end}}">{{if $line.RightIdx}}{{$line.RightIdx}}{{end}}</span>
+														<td class="lines-num lines-num-new" data-line-num="{{if $line.RightIdx}}{{$line.RightIdx}}{{end}}">
+															<span rel="{{if $line.RightIdx}}diff-{{Sha1 $file.Name}}R{{$line.RightIdx}}{{end}}"></span>
+														</td>
+														<td class="lines-type-marker">
+															<pre>{{if $line.RightIdx}}<span class="line-type-marker" data-type-marker="{{$line.GetLineTypeMarker}}"></span>{{end}}</pre>
 														</td>
-
 														<td class="lines-code lines-code-new halfwidth">
 															{{if and $.SignedUserID $line.CanComment $.PageIsPullFiles (not (eq .GetType 3))}}
 																<a class="ui green button add-code-comment add-code-comment-right" data-path="{{$file.Name}}" data-side="right" data-idx="{{$line.RightIdx}}">+</a>
 													{{if gt (len $line.Comments) 0}}
 														<tr class="add-code-comment">
 															<td class="lines-num"></td>
+															<td class="lines-type-marker"></td>
 															<td class="add-comment-left">
 																{{if eq $line.GetCommentSide "previous"}}
 																	<div class="field comment-code-cloud">
 																{{end}}
 															</td>
 															<td class="lines-num"></td>
+															<td class="lines-type-marker"></td>
 															<td class="add-comment-right">
 																{{if eq $line.GetCommentSide "proposed"}}
 																	<div class="field comment-code-cloud">

templates/repo/diff/section_unified.tmpl

 				{{/* {{if gt $j 0}}<span class="fold octicon octicon-fold"></span>{{end}} */}}
 			</td>
 			{{else}}
-			<td class="lines-num lines-num-old">
-				<span rel="{{if $line.LeftIdx}}diff-{{Sha1 $file.Name}}L{{$line.LeftIdx}}{{end}}">{{if $line.LeftIdx}}{{$line.LeftIdx}}{{end}}</span>
+			<td class="lines-num lines-num-old" data-line-num="{{if $line.LeftIdx}}{{$line.LeftIdx}}{{end}}">
+				<span rel="{{if $line.LeftIdx}}diff-{{Sha1 $file.Name}}L{{$line.LeftIdx}}{{end}}"></span>
 			</td>
-			<td class="lines-num lines-num-new">
-				<span rel="{{if $line.RightIdx}}diff-{{Sha1 $file.Name}}R{{$line.RightIdx}}{{end}}">{{if $line.RightIdx}}{{$line.RightIdx}}{{end}}</span>
+			<td class="lines-num lines-num-new" data-line-num="{{if $line.RightIdx}}{{$line.RightIdx}}{{end}}">
+				<span rel="{{if $line.RightIdx}}diff-{{Sha1 $file.Name}}R{{$line.RightIdx}}{{end}}"></span>
 			</td>
 			{{end}}
+			<td class="lines-type-marker">
+				<pre><span class="line-type-marker" data-type-marker="{{$line.GetLineTypeMarker}}"></span></pre>
+			</td>
 			<td class="lines-code {{if (not $line.RightIdx)}}lines-code-old{{end}}">
 				{{if and $.root.SignedUserID $line.CanComment $.root.PageIsPullFiles}}
 					<a class="ui green button add-code-comment add-code-comment-{{if $line.RightIdx}}right{{else}}left{{end}}" data-path="{{$file.Name}}" data-side="{{if $line.RightIdx}}right{{else}}left{{end}}" data-idx="{{if $line.RightIdx}}{{$line.RightIdx}}{{else}}{{$line.LeftIdx}}{{end}}">+</a>
 		{{if gt (len $line.Comments) 0}}
 		<tr>
 			<td colspan="2" class="lines-num"></td>
+			<td class="lines-type-marker"></td>
 			<td class="add-comment-left add-comment-right">
 				<div class="field comment-code-cloud">
 					<div class="comment-list">