Have a template of that form:
```xml
<t t-if=""/>
<!-- Comment -->
<t t-elif=""/>
```
Before this commit, both python and JS crashed because any type of node
between branching directive was forbidden
After this commit, Comments are just ignored and removed, while actual
template nodes are still forbidden between branching directives
There is no crash anymore
closesodoo/odoo#45899
Signed-off-by: Lucas Perais (lpe) <lpe@odoo.com>
A new preprocess method is added to the template engine in order to do
preprocessing/sanitization of the templates before compilation.
This method can be overloaded in order to add new features such as
translation, ...
* document qweb based (mostly) on JS version
* convert JS qweb tests to (mostly) language-independent XML so they can be
used for JS and Python implementations
* add some more tests (e.g. precedence between t-value and body in t-set)
* remove ``t-import``
* fix parity in foreach(dict) (and rename some variables to make array and
object versions more similar)
Lucas Perais (lpe)