1832443 - A user-select: none span at the end of a paragraph hides the EOL from the clipboard

Status: NEW

(Core :: DOM: Copy & Paste and Drag & Drop, defect)

Description

[Martin Thomson [:mt:]]

If I construct HTML as follows

<style>.u { user-select: none; }</style>
<p>One<span class="u">.</span></p>
<p>Two<span class="u">.</span></p>
<p>Three<span class="u">.</span></p>

Copying the content of this HTML omits the periods, but it also omits any end-of-line characters that might be expected. Selecting the entire document above, copying, then pasting into a text editor produces the string "OneTwoThree" when copied from Firefox. In Edge, it produces "One\r\n\r\nTwo\r\n\r\nThree", which is closer to what you might expect.

Background: IETF documents include a pilcrow at the end of each paragraph. This exists to provide a link to that paragraph, but these are styled user-select: none so that copy and paste does not pick them up as noise. Usually, this bug is easy to work around, but I recently had cause to dump a longer document using copy-paste, which hit this bug.

Bonus bug:

The following is quite surprising.

<p>One<span class="u">.</span><br/>Two</p>

Rather than copy a single end-of-line in this case, Firefox includes three.

Comment 2

[Sean Feng [:sefeng211]]

NI myself to take a look

Comment 3

[Sean Feng [:sefeng211]]

Clear my NI given I won't be able to work on this

Comment 4

[Masayuki Nakano [:masayuki] (he/him)(JST, +0900)]

This will be fixed by the fix of bug 1998858.

Currently, Gecko starts new range at next leaf after a non-selectable node. Therefore, in the case, the start boundary of the following paragraph is not contained in the range. However, bug 1998858 will make Gecko stop excluding non-selectable nodes from the user selected range. Therefore, the start boundary of the paragraph will be selected and serialized when copied into the clipboard.