1118204 - Scrolling inside a textarea that's not completely displayed should scroll the page first

Status: NEW

(Core :: General, defect)

Description

[Julien Wajsberg [:julienw]]

Attachment: test-textarea.html

STR:
1. open the attached file
2. if the textarea is fully visible, resize your browser window so that only part of the textarea is visible
3. put your mouse cursor on the textarea
4. scroll down using your mousewheel or trackpad or whatever simulates a mousewheel

Expected:
* the page scrolls down so that we can see the textarea completely, and then scrolls down the textarea if it is scrollable

Actual:
* the textarea is scrolled down first

Rationale is that when we scroll down the page, we can see also see the needed text in the textarea, but we also see more of the textarea itself.

Of course, we need the same behavior when scrolling up. We also need to take care of textareas that are higher than the window's height.

Note that I get this a lot when editing wiki.mozilla.org.

(I wasn't sure of the component, so I put this in General).