Before this commit, the design tab retrieved the current styles
exclusively from the `#design-element` style element. This meant that if
a template included that element to define its own styles, the defaults
were lost for the styles that it didn't define.
This reads the styles from the DOM instead so this is never an issue.
In order for the design tab to have values to read, we initialized the
`#design-tab` element with the css of the page. This was a temporary
workaround. Now that values are read via `getComputedStyle`, we don't
need it anymore.
task-2833420
closesodoo/odoo#89745
X-original-commit: e8f2f71f76f86bae84253374935fd7d14428746d
Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>
Antoine Guenet
5764c74232