Strip leading space for first combinators (#1807)

src/printer.js

@@ -2690,7 +2690,9 @@ function genericPrintNoParens(path, options, print, args) {
     }
     case "selector-combinator": {
       if (n.value === "+" || n.value === ">" || n.value === "~") {
-        return concat([" ", n.value, " "]);
+        const parent = path.getParentNode();
+        const leading = parent.type === "selector-selector" && parent.nodes[0] === n ? "" : " ";
+        return concat([leading, n.value, " "]);
       }
       return n.value;
     }

tests/css_combinator/__snapshots__/jsfmt.spec.js.snap

@@ -8,3 +8,24 @@ exports[`combinator.css 1`] = `
 }
 
 `;
+
+exports[`leading.css 1`] = `
+a {
+  > * {
+  }
+  &, > * {
+  }
+  + * {
+  }
+}
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+a {
+  > * {
+  }
+  &, > * {
+  }
+  + * {
+  }
+}
+
+`;

tests/css_combinator/leading.css

@@ -0,0 +1,8 @@
+a {
+  > * {
+  }
+  &, > * {
+  }
+  + * {
+  }
+}

tests/stylefmt/nested-2/__snapshots__/jsfmt.spec.js.snap

@@ -29,13 +29,13 @@ color:blue;}  &:nth-child(5n+1) {
   &:nth-child(-n + 3) {
     color: green;
   }
-   > li > a {
+  > li > a {
     color: red;
   }
-   > li > li {
+  > li > li {
     color: blue;
   }
-   > p + p {
+  > p + p {
     color: green;
   }
 }

tests/stylefmt/nested/__snapshots__/jsfmt.spec.js.snap

@@ -20,12 +20,12 @@ padding: 10px;   .nested-2-1{
 .foo {
   font-size: 12px;
 
-   > .nested-1 {
+  > .nested-1 {
     padding: 10px;
     .nested-2-1 {
       color: red;
     }
-     + .nested-2-2 {
+    + .nested-2-2 {
       color: blue;
     }
   }