Hi Toufiq,
My description of the issues was not very specific, I agree with you.
In the first place, with "customizations" I meant to say that we made template overrides. Also, the site features a custom component, built for us by a Joomla developer who also has extensions in the JED, and we had to make some overrides on his original views (tested for Protostar) for compatibility with the template.
Specific issues that I found until now are:
- Using the off-canvas switch does not render a visible menu on the page, only a page overlay.
- We made an override for the pagination, e.g. in article blog views, which seems to be bypassed now as the pagination looks the same as it did before we added the override.
- Most of the styling stays the same, but some of buttons and lists have changed.
- In some of our list overrides we have Joomla search bars, these have disappeared.
- The position of the system-message-container is moved to the lower right corner of the window
- Also, as the FontAwesome version has changed, we have to adjust a number of overrides as these contain FA icons in list and buttons.