Bug 1878355: Include display: inline-block when adding spaces between text alternatives, r=Jamie

When Gecko computes the text alternative for accessibles, it avoids jamming
names together without spaces between them for elements with block-like CSS
display styles. This revision adds "inline-block" to that block-like list. It
also removes the relevant expected failures from the WPT meta file.

Differential Revision: https://phabricator.services.mozilla.com/D204561

accessible/base/nsTextEquivUtils.cpp

@@ -165,6 +165,7 @@ nsresult nsTextEquivUtils::AppendFromAccessible(Accessible* aAccessible,
         // together in final name.
         const nsStyleDisplay* display = frame->StyleDisplay();
         if (display->IsBlockOutsideStyle() ||
+            display->mDisplay == StyleDisplay::InlineBlock ||
             display->mDisplay == StyleDisplay::TableCell) {
           isHTMLBlock = true;
           if (!aString->IsEmpty()) {

accessible/tests/mochitest/name/test_general.html

@@ -105,7 +105,7 @@
       // The label element contains the button. The name is calculated from
       // this button.
       // Note: the name contains the content of the button.
-      testName("btn_label_inside", "text10text");
+      testName("btn_label_inside", "text 10 text");
 
       // The label element and the button are placed in the same form. Gets
       // the name from the label subtree.

testing/web-platform/meta/accname/name/comp_name_from_content.html.ini

@@ -20,15 +20,6 @@
   [heading with link referencing image using aria-labelledby, that in turn references itself and another element via aria-labelledby]
     expected: FAIL
 
-  [button name from content for each child (no space, display:inline-block)]
-    expected: FAIL
-
-  [heading name from content for each child (no space, display:inline-block)]
-    expected: FAIL
-
-  [link name from content for each child (no space, display:inline-block)]
-    expected: FAIL
-
   [button name from fallback content mixing attr() and strings with ::before and ::after]
     expected: FAIL