1149491 - window.getSelection() gives high rangeCounts

Status: UNCONFIRMED

(Core :: DOM: Selection, defect)

Description

[porl]

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:36.0) Gecko/20100101 Firefox/36.0
Build ID: 20150321212544

Steps to reproduce:

1. Visit
      http://en.wikipedia.org/wiki/Rattlesnakes_%28album%29
    (for example)
2. From the menu, select all.
3. In Scratchpad, run 
  alert(window.getSelection().rangeCount);


Actual results:

I see 14 ranges.


Expected results:

The docs say

| Before the user has clicked a freshly loaded page, the rangeCount is
| 0. A user can normally only select one range at a time, so the
| rangeCount will usually be 1.

https://developer.mozilla.org/en-US/docs/Web/API/Selection/
rangeCount

and this was the behaviour of earlier Fx versions.

Multiple ranges make it more difficult to extract the HTML source of a user selection in, e.g., bookmarklets.

Comment 1

[Aleksandrs Ļedovskis]

Here's reduced case - https://jsfiddle.net/qjnu2wpf/

I spotted this interesting behavior when checking GitLab bug (https://gitlab.com/gitlab-org/gitlab-ce/issues/31193#note_27816376)

Can somebody recheck this 2+ year old bug? It reliably happens on latest Nightly