There was a problem with the new `ajax.loadXML` implementation
introduced with 417a664f16
Indeed the following case was buggy:
```
ajax.loadXML('URL1', qweb);
ajax.loadXML().then(function () {
ajax.loadXML('URL2', qweb);
});
```
With this code, 'URL2' is scheduled to be loaded when 'URL1' is fully
loaded. The problem is that the deferred returned by the call to
`ajax.loadXML` without argument was resolved before the internal
`isLoading` variable was reset to `false`. So, the loading of 'URL2'
was indeed scheduled when 'URL1' was fully loaded but its loading
never started because the `ajax.loadXML` loading loop was still marked
as running (so it was not started again as it should have been).
qsm-odoo
fdc8bc1711