[FIX] mail, *: significantly reduce number of useless renders

* = hr_holidays, im_livechat, website_livechat

A huge amount of components where rendered for no reason, notably when typing a
new message (at every key press), which significantly slowed down the interface.

There were 2 causes to this number of renders:
- OWL rendering all children automatically, even if their props didn't change,
  unless `shouldUpdate` is overridden, which is now done.
- `useStore` selectors being way too generous in what they observed

task-2399731

closes odoo/odoo#62703

Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>

1 files changed, 0 insertions, 2 deletions

diff --git a/addons/mail/static/src/components/composer/composer_tests.js b/addons/mail/static/src/components/composer/composer_tests.js
index fcea8b5a3ab..98f969438eb 100644
--- a/addons/mail/static/src/components/composer/composer_tests.js
+++ b/addons/mail/static/src/components/composer/composer_tests.js
@@ -781,8 +781,6 @@ QUnit.test("channel with no commands should not prompt any command suggestions o
     await afterNextRender(() => {
         document.querySelector('.o_ComposerTextInput_textarea').focus();
         document.execCommand('insertText', false, "/");
-    });
-    await afterNextRender(() => {
         const composer_text_input = document.querySelector('.o_ComposerTextInput_textarea');
         composer_text_input.dispatchEvent(new window.KeyboardEvent('keydown'));
         composer_text_input.dispatchEvent(new window.KeyboardEvent('keyup'));