Typing # or - or * in editor silently stops saving the document

[btheado]

After any of #, -, or * characters are typed at the start of a line in a documentation section, no future changes to the document are saved until the page is reloaded.

In the console I see errors like:

ide.ts:871 Uncaught Error: The runtime may not add, remove, or move editor controlled spans of type 'heading'. Expected 0 got 1

No other indication is given that changes are no longer being saved.

[btheado]

Another way to get the same error and non-functional saving is to create a header followed by an eve block like this:

Header

search

Place the cursor before the 's' and hit backspace. The string "search" will be merged in with the header, but they will also be in the code block. The same uncaught error about "uncontrolled spans of type 'heading'" appears in the console.

Then another uncaught error can be elicited by hitting Ctrl-z to undo. Here is the message:

spans.ts:410 Uncaught Error: Unable to create BlockSpan starting in middle of line at (162, 6)

[joshuafcole]

This is a duplicate of #701. Let's track it there.