When there are many events at the same moment in a calendar,
events are thin and on mouse hover the event take all the width.
Before this commit, when we drag or we resize a event in calendar,
the event returns to the state thin.
After this commit, the width event stay width during resizing and
draging.
closesodoo/odoo#38384
X-original-commit: 405294602070590083a2b438f631615f72000292
Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>