Bug editing header of collapsed method

[ghost]

• VSCode Version: 1.12.0-insider
• OS Version: Linux Mint 18

Steps to Reproduce:

1. Paste this code:

class C {
    m() {
        if (true) {
            return;
        }
    }
}

2. Ctrl-K, Ctrl-0 to collapse all.
3. Expand class C. (Do not expand the m.)
4. Click inside the parens in m and write param: number.
5. An extra ... symbol appears in the middle of the inserted text.

[aeschli]

The bug is related to the view model mapping. Hidden markers are mapped to the end of the visible line, but not updated if that line is edited.

• create the following typescript file
• collapse m(..): Squiggly is at the end of the line
• type inside the comment: Squiggly is no longer at the end of the line

class C {
    m(/**/){
        if (true1) {
            return;
        }
    }
}

[alexdima]

This has been fixed in the meantime via #36410