Undefined pages when pasting text

[5e-Cleric]

Tested in

Operating System	Browser	Renderer
Windows	Chrome 128	v3

Description of the issue

When pasting text in a brew with multiple pages, the DOM seems to update incorrectly, leaving unreferenced pages in the preview. See attached file:

Grabacion.2024-09-08.104936.mp4

[calculuschild]

For posterity, the issue was caused by the page at the current cursor position being given first priority when rendering pages. This is desired in most cases, since it allows cross-page content (variables, links) to update first before re-rendering other pages. This breaks if we suddenly reduce the number of pages with the editor cursor on the last page:

1. CTRL+A places the cursor at the last page
2. pasting over the editor with fewer pages means the last known "cursor page" is greater than the actual page count.
3. BrewRenderer attempts to render the last known "cursor page", which is empty, resulting in an "unknown" content page.