1206676 - Firefox resets <textarea>'s size if user resizes it by DoubleClicking on resizer and then moving the mouse

Status: NEW

(Core :: Layout: Form Controls, defect)

Description

[arni2033]

STR:   (Win7_64, Nightly 43, 32bit, ID 20150920030217, new profile, safe mode)
1. Open the following "data:" url or click URL in the form above
>   data:text/html,<textarea>
2. Move mouse over the textarea's resizer [now don't move mouse until Step 4]
3. Press left mouse button, after ~0.1 seconds release left mouse button, then after ~0.1 seconds press left mouse button again (so, just perform DoubleClick without releasing mouse in the end)
4. Move mouse to another position to resize <textarea>
5. Release left mouse button.

Result:       You see textarea in step 4 resizing when you move mouse.
              However, after performing Step 5 <textarea> restores its old dimentions.
Expectations: Textarea should be resized in a normal way

This is very annoying long-standing bug. See also bug 1200031 about another incredible <textarea> issue

Comment 1

[Abe - QA (:Abe_LV)]

 User Agent:	Mozilla/5.0 (Windows NT 6.1; rv:45.0) Gecko/20100101 Firefox/45.0
 Nightly 45.0a1 Build ID:  20151204030208
 and Firefox 42.0

I am unable to reproduce it in the latest version. See also 1200031.

Comment 2

[arni2033]

Attachment: screencast - Firefox resets textarea's size if user resizes it by DoubleClicking on resizer and then moving the mouse.webm

This is still reproducible on Nightly 45 (20151205030208).
Are you sure that you performed STR correctly? Additionally: Firefox always resizes textarea to "initial" sise on simple doubleclick on the dropmarker. Have you seen at least that behavior?

Comment 3

[Abe - QA (:Abe_LV)]

Yes, I am able to reproduce this. Thanks. 
There are related bug[1105906,1200031]. Not sure if this is duplicate.