Modal scrolling issue

[tommykri]

Describe the bug
I'm using Bootstrap and when the modals become too long for the user’s viewport or device it will by default scroll independent of the page itself. That works perfectly fine for modals that are present on the initial page which you request in the browser, but if you are then navigating to a different route inside of the application the modals on those pages are not scrollable.

To Reproduce
Steps to reproduce the behavior:

1. Make the height of your browser small, for example 400 px.
2. Go to https://bootstrapdemo.blazorise.com/tests/modals.
3. Click 'Standard Modal' and as expected it will scroll because the content is to long for the viewport.
4. Click a link in the sidebar to got to a different route.
5. Click "Modals" in the sidebar to go back to the modals page.
6. Click on 'Standard Modal' again and see that the content in the modal in no longer scrollable.

Expected behavior
I want to be able to use scrolling for modals that are too long for the user’s viewport and are loaded on different routes.