formerly-readonly <input> doesn't display cursor when focused

Originator:cvrebert
Number:rdar://20090003 Date Originated:09-Mar-2015
Status:Open Resolved:
Product:Safari Product Version:8.0.3 (10600.3.18)
Classification:UI/Usability Reproducible:Always
 
Summary:
An <input> switched from readonly to read-write by a dblclick event handler doesn't have a cursor displayed in it when it becomes focused. A cursor only appears after typing a character into the <input>.

Steps to Reproduce:
1. Open http://jsfiddle.net/2matzLja/1/show/ in Safari 8.0.3
2. Double-click on the <input>. Note that a focus ring is displayed on it.

Expected Results:
A text cursor should be displayed in the <input>, just as with a normal has-always-been-writeable <input>.

Actual Results:
No text cursor is displayed in the <input>.
However, you can still type in the <input>, and as soon as you type a character into the <input>, the text cursor starts being displayed.

Version:
OS X Yosemite

Notes:
WebKit bug: https://bugs.webkit.org/show_bug.cgi?id=142477
The example's source code can be viewed at http://jsfiddle.net/2matzLja/1/
Original Bootstrap bug report: https://github.com/twbs/bootstrap/issues/16022
Related Chrome bug: https://code.google.com/p/chromium/issues/detail?id=465274

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