[REF] web,*: ActionManager/ViewManager refactoring

This rev. is the first part (out of 3) of the refactoring of the
ActionManager and ViewManager layer of the webclient.

The main changes are:
  - there is no ViewManager anymore, its work is now handled by the
    ActionManager itself, but isolated in a specific file ; this
    eases a lot of things, as the breadcrumbs handling for example.
  - the ActionManager code is converted to the new coding principles
    and guidelines ; mainly, children widgets communicate with it by
    triggering events up, and not by function calls anymore.
  - the ActionManager layer is now testable, and a lot of tests have
    already been written.
  - the code in other addons has been adapted consequently.

What's coming next:
  - introduce the 'AbstractAction' Widget, and make client actions
    and view controllers inherit from it ; this widget will
    implement a common API that could be used uniformly by the
    ActionManager (e.g. restore(), canBeLeft(), renderButtons(),
    getTitle()...).
  - move the ControlPanel handling from the ActionManager to the
    AbstractAction.

7 files changed, 3 insertions, 18 deletions

diff --git a/addons/web/static/src/less/fields.less b/addons/web/static/src/less/fields.less
index 3c6428e5c75..e8bf81c9448 100644
--- a/addons/web/static/src/less/fields.less
+++ b/addons/web/static/src/less/fields.less
@@ -33,7 +33,7 @@
     }
 
     // Block fields
-    &.note-editor, &.oe_form_field_html, &.oe_form_field_html_text, &.oe_form_field_text, &.o_view_manager_content, &.o_field_domain, &.o_graph_linechart, &.o_graph_barchart {
+    &.note-editor, &.oe_form_field_html, &.oe_form_field_html_text, &.oe_form_field_text, &.o_field_domain, &.o_graph_linechart, &.o_graph_barchart {
         display: block;
     }
 
diff --git a/addons/web/static/src/less/form_view.less b/addons/web/static/src/less/form_view.less
index 36002ace912..8a053a8cca3 100644
--- a/addons/web/static/src/less/form_view.less
+++ b/addons/web/static/src/less/form_view.less
@@ -431,7 +431,7 @@
 
     // One2Many, Many2Many outside of group
     .o_field_widget {
-        &.o_view_manager_content, &.o_field_one2many, &.o_field_many2many {
+        &.o_field_one2many, &.o_field_many2many {
             width: 100%;
             > div {
                 width: 100%;
diff --git a/addons/web/static/src/less/graph_view.less b/addons/web/static/src/less/graph_view.less
index f77b4faa9d0..fc8fc323582 100644
--- a/addons/web/static/src/less/graph_view.less
+++ b/addons/web/static/src/less/graph_view.less
@@ -1,6 +1,4 @@
 .o_graph {
-    height: 100%;
-
     .o_graph_svg_container {
         height: 100%;
         overflow: auto;
diff --git a/addons/web/static/src/less/modal.less b/addons/web/static/src/less/modal.less
index a223deb55ef..5b74583ee41 100644
--- a/addons/web/static/src/less/modal.less
+++ b/addons/web/static/src/less/modal.less
@@ -23,10 +23,6 @@
                     float: right;
                 }
             }
-
-            .o_view_manager_content {
-                position: static;  // Reset position for view managers in modals (default value: absolute)
-            }
         }
 
         .modal-footer {
diff --git a/addons/web/static/src/less/pivot_view.less b/addons/web/static/src/less/pivot_view.less
index 2fa6e1a6f44..d7dfdd45de5 100644
--- a/addons/web/static/src/less/pivot_view.less
+++ b/addons/web/static/src/less/pivot_view.less
@@ -1,5 +1,4 @@
 .o_pivot {
-    height: 100%;
     overflow: auto;
 
     // Inform the user that he may click on a cell to be redirected to a list view of the
diff --git a/addons/web/static/src/less/views.less b/addons/web/static/src/less/views.less
index ee82aa5d9e5..48117cb1b75 100644
--- a/addons/web/static/src/less/views.less
+++ b/addons/web/static/src/less/views.less
@@ -4,9 +4,6 @@
  */
 
 // No content helper
-.o_view_manager_content > div {
-    height: 100%;
-}
 .oe_view_nocontent {
     a {
         cursor: pointer;
diff --git a/addons/web/static/src/less/webclient_layout.less b/addons/web/static/src/less/webclient_layout.less
index b389a919a1e..f876d8b3527 100644
--- a/addons/web/static/src/less/webclient_layout.less
+++ b/addons/web/static/src/less/webclient_layout.less
@@ -155,14 +155,9 @@
                 overflow: auto;
                 position: relative;
 
-                .o_view_manager_content {
+                > .o_view_controller {
                     .o-position-absolute(0, 0, 0, 0);  // Get the 100% height of its flex parent
                     height: 100%;
-
-                    .o_view_manager_content {
-                        position: static;  // Reset position for nested view managers
-                        height: auto;  // reset height inheritance for nested view managers
-                    }
                 }
             }
         }