Bug 1301342 - add noautohide=true on XUL panel wrapper for HTMLTooltip;r=gl

MozReview-Commit-ID: AL4dc0Lp4GG

--HG--
extra : rebase_source : 1969b9a404eb4a7cd9e26d93b086930eddc24905

devtools/client/shared/test/browser_html_tooltip-03.js

@@ -43,7 +43,14 @@ add_task(function* () {
 
   info("Run tests for a Tooltip with a XUL panel");
   useXulWrapper = true;
-  yield runTests(doc);
+
+  let isLinux = Services.appinfo.OS === "Linux";
+  if (!isLinux) {
+    // Skip these tests on linux when using a XUL Panel wrapper because some linux window
+    // manager don't support nicely XUL Panels with noautohide _and_ noautofocus.
+    // See https://bugzilla.mozilla.org/show_bug.cgi?id=1301342#c11
+    yield runTests(doc);
+  }
 });
 
 function* runTests(doc) {

devtools/client/shared/widgets/tooltip/HTMLTooltip.js

@@ -572,6 +572,7 @@ HTMLTooltip.prototype = {
     panel.setAttribute("animate", false);
     panel.setAttribute("consumeoutsideclicks", false);
     panel.setAttribute("noautofocus", true);
+    panel.setAttribute("noautohide", true);
     panel.setAttribute("ignorekeys", true);
 
     // Use type="arrow" to prevent side effects (see Bug 1285206)