[REF] *: make stronger bootstrap assets

* portal, theme_bootswatch, web, web_editor, website

With less2sass and bs3tobs4 tasks, the assets structure was reviewed to
handle the specificities of both framework and to prepare for our next
odoo tasks. In particular, the assets_helpers and bootstrap overrides
were basically split into 4 parts: utils, primary variables, secondary
variables and bootstrap variables.
(see https://github.com/odoo/odoo/commit/6e4db7d13a926845bf82f5b035afede42d6d5a89)

Using the !default system for the bootstrap variables parts seems now
a good improvement. This is part of what this commit does: adding the
default flag for all bootstrap variables overrides and inverting the
order of the files in the _assets_backend_helpers and
_assets_frontend_helpers templates. This allows to avoid code like this:

portal:
```
$body-bg: white;
```

website:
```
@​if $var != null {
    $body-bg: $var;
}
```

This code makes the body white with portal or equal to $var with website
if $var has a value. The same behavior in the new file order is achieved
with:

website:
```
$body-bg: $var !default;
```

portal:
```
$body-bg: white !default;
```

This order is now also followed for the _assets_secondary_variables
templates (there are only a few).

This commit also make better assets hierarchy by making website inherit
from portal assets (instead of web) and portal inherit from web_editor
assets (instead of web) (thus relying on strong dependencies instead of
installation order which is not always right for migrated databases).

closes odoo/odoo#29757

1 files changed, 8 insertions, 2 deletions

diff --git a/addons/web_editor/views/editor.xml b/addons/web_editor/views/editor.xml
index d180831b616..ac8b3c396f3 100644
--- a/addons/web_editor/views/editor.xml
+++ b/addons/web_editor/views/editor.xml
@@ -58,6 +58,12 @@
     </xpath>
 </template>
 
+<template id="_assets_secondary_variables" inherit_id="web._assets_secondary_variables">
+    <xpath expr="//link" position="before">
+        <link rel="stylesheet" type="text/scss" href="/web_editor/static/src/scss/secondary_variables.scss"/>
+    </xpath>
+</template>
+
 <template id="assets_common" inherit_id="web.assets_common" name="Web Editor Common Assets (used in backend interface and website)">
     <xpath expr="script[last()]" position="after">
         <script type="text/javascript" src="/web_editor/static/lib/vkbeautify/vkbeautify.0.99.00.beta.js"></script>
@@ -67,7 +73,7 @@
 </template>
 
 <template id="_assets_backend_helpers" inherit_id="web._assets_backend_helpers">
-    <xpath expr="//link[last()]" position="after">
+    <xpath expr="//link" position="before">
         <link rel="stylesheet" type="text/scss" href="/web_editor/static/src/scss/bootstrap_overridden.scss"/>
     </xpath>
 </template>
@@ -83,7 +89,7 @@
 </template>
 
 <template id="_assets_frontend_helpers" inherit_id="web._assets_frontend_helpers">
-    <xpath expr="//link[last()]" position="after">
+    <xpath expr="//link" position="before">
         <link rel="stylesheet" type="text/scss" href="/web_editor/static/src/scss/bootstrap_overridden.scss"/>
     </xpath>
 </template>