[IMP] website, *: move page scrollbar to #wrapwrap

*: web, web_editor, portal, account, website_blog, website_forum

This is probably not ideal to move the scrolling behavior out of the
html element but this will be needed for the editor to not have a double
scrollbar on the right. This is actually also useful for the scrollbar
to appear under the purple odoo menu instead of its right.

This commit, if to be reverted in the future, however contains many
improvements to make the transition easier that should be kept: jQuery
and Odoo functions to be able to scrollTo a specific element, get the
top scrollable element, check if an element is scrollable, etc. Also,
some magic was done: if some code tries to scroll to a specific scroll
position via jQuery's scrollTop or animate functions on the html/body
element, those will still work as intended (obviously, using the new
utils to do that is however recommended).

This commit also reviews our scroll behaviors to make them more robust
and share the code.

Part of https://github.com/odoo/odoo/pull/57975
task-2344227

1 files changed, 10 insertions, 2 deletions

diff --git a/addons/web/static/src/scss/base_frontend.scss b/addons/web/static/src/scss/base_frontend.scss
index f1c341a89f9..585ce965ec5 100644
--- a/addons/web/static/src/scss/base_frontend.scss
+++ b/addons/web/static/src/scss/base_frontend.scss
@@ -1,4 +1,9 @@
 // Frontend general
+html, body, #wrapwrap {
+    width: 100%;
+    height: 100%;
+    overflow: hidden;
+}
 #wrapwrap {
     // The z-index is useful to prevent that children with a negative z-index
     // go behind the wrapwrap (we create a new stacking context).
@@ -6,8 +11,11 @@
     position: relative;
     display: flex;
     flex-flow: column nowrap;
-    width: 100%;
-    min-height: 100%;
+    // ... we delegate the scroll to that top element instead of the window/body
+    // This is at least needed for the edit mode to not have a double scrollbar
+    // due to the right editor panel (and since we want to minimize the style
+    // difference between edit mode and non-edit mode (wysiwyg)...).
+    overflow: auto;
 
     > * {
         flex: 0 0 auto;