553272 - in chrome, iframes content-targetable are displayed above everything

Status: NEW

(Core :: XUL, defect)

Description

[José-Hugues POMMIER]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US) AppleWebKit/532.5 (KHTML, like Gecko) Chrome/4.0.249.89 Safari/532.5
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.0; fr; rv:1.9.2) Gecko/20100115 Firefox/3.6 (.NET CLR 3.5.30729)

When you window.open('...', '', 'chrome')

(...)
<box style="overflow:scroll"><iframe type="content-targetable">
(...)

then the iframe is rendered above every other xul elements. 


if you remove type="content-targetable", an awfull flickering effect occurs during scroll.



Reproducible: Always

Steps to Reproduce:
1. save the following code in your chrome path, ex : test.xul

<?xml version="1.0"?>
<?xml-stylesheet href="chrome://global/skin/" type="text/css"?>
<window id="iframeTest" title="iframeTest"
			xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" 
         width="400"
         height="410"
			>
   <vbox anonid="filbox" style="overflow-x:none; overflow-y:scroll;background-color:blue;" height="200">
      <iframe type="content-targetable" style="margin:4px 4px 0px 4px;padding:5px;border: 1px solid #aaa;"  id="iframeTest" src="about:blank" width="500" height="350"/>
   </vbox>
   <splitter />  
   <vbox style="background-color:green;" flex="1">
      <label>texte qui est recouvert</label>
      <label>texte qui est recouvert</label>
      <label>texte qui est recouvert</label>
      <label>texte qui est recouvert</label>
   </vbox>
</window>

2. open it (using jsconsole for example) : 
window.open('chrome://(...)/content/test.xul', 'test', "chrome", null);
Actual Results:  
the iframe (white square) is rendered above the vbox (green square)

Expected Results:  
the iframe (white square) should pass below the vbox (green square)

This bug doesn't occur with FFox 3.5.x !

It occurs with FFox 3.7 alpha and the latest nightly build.
Same problem under linux.

Comment 1

[Boris Zbarsky [:bzbarsky]]

The "above everything" thing is due to the widgets those iframes have.  I have no idea why the behavior was different in 3.5.

I assume type="content" would have the same issue, yes?

Comment 2

[Robert O'Callahan (:roc) (email my personal email if necessary)]

In 3.5 the scrollable box had its own widget, which probably helped somehow. In 3.6, it doesn't.

In 3.7, bug 130078 will fix this. I don't think we'll be able to fix it for 3.6.

Comment 3

[José-Hugues POMMIER]

(In reply to comment #1)
> The "above everything" thing is due to the widgets those iframes have.  I have
> no idea why the behavior was different in 3.5.
> 
> I assume type="content" would have the same issue, yes?

yes, same issue using type="content".