Fix line-button issue after file selection in file tree (#34574) (#34576)

Backport #34574

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Co-authored-by: Kerwin Bryant <kerwin612@qq.com>

web_src/css/base.css

@@ -867,6 +867,7 @@ overflow-menu .ui.label {
 }
 
 .file-view tr.active .lines-num,
+.file-view tr.active .lines-escape,
 .file-view tr.active .lines-code {
   background: var(--color-highlight-bg) !important;
 }