1200031 - Pressing left mouse button on <textarea>'s border and releasing it over resizer causes text selection with left mouse button not pressed

Status: NEW

(Core :: Layout: Form Controls, defect)

Description

[arni2033]

STR:   (Win7_64, Nightly 43, 32bit, ID 20150828030205, new profile, HWA off)
1. Open this "data:" URL in new tab
data:text/html,<textarea style="border: 20px solid rebeccapurple; background:red; width:450px; height:150px">Lorem Ipsum
2. Move mouse button to the purple border of <textarea>
3. Press left mouse button
4. Move mouse over <textarea>'s resizer
5. Release left mouse button
6. Move mouse between "p" and "s" in word "Ipsum"

Result:       Text "sum" is being selected
Expectations: No text selection because left mouse button isn't pressed

Comment 1

[arni2033]

I Regularly experience this in Bugzilla and other places, because textarea has border:1px; by default:
1) I hover mouse over right border of resizer
2) I miss a bit, and press left mouse button on textarea's border instead of the resizer
3) Move mouse a bit left to resize
4) Notice that I'm not resizing textarea
5) Release left mouse button over resizer [releasing mouse over resizer doesn't exit text selection mode]
6) Then click again (on resizer), actually resize
7) Release mouse and move it over text. Due to Step 5 text is being selected.

Mark this as obsolete, if needed. I just wanted to say that it happens everywhere.