Bug 1323713 - fix prettify CSS error when encountering extra closing brace;r=tromey

MozReview-Commit-ID: 5TAxEP5561K

--HG--
extra : rebase_source : 41fdc014c018d2f2611e698a2292d15978e49df8

devtools/shared/inspector/css-logic.js

@@ -284,7 +284,11 @@ function prettifyCSS(text, ruleCount) {
     }
 
     if (isCloseBrace) {
-      indent = TAB_CHARS.repeat(--indentLevel);
+      // Even if the stylesheet contains extra closing braces, the indent level should
+      // remain > 0.
+      indentLevel = Math.max(0, indentLevel - 1);
+
+      indent = TAB_CHARS.repeat(indentLevel);
       result = result + indent + "}";
     }
 

devtools/shared/tests/unit/test_prettifyCSS.js

@@ -49,6 +49,19 @@ const TESTS = [
       "}"
     ]
   },
+
+  { name: "CSS with extra closing brace",
+    input: "body{margin:0}} div{color:red}",
+    expected: [
+      "body {",
+      "\tmargin:0",
+      "}",
+      "}",
+      "div {",
+      "\tcolor:red",
+      "}",
+    ]
+  },
 ];
 
 function run_test() {