821277 - Selection slow in large text

Status: RESOLVED DUPLICATE of bug 667243

(Firefox for Android Graveyard :: Text Selection, defect)

Description

[Teodora Vermesan]

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20100101 Firefox/17.0
Build ID: 20121128204232

Steps to reproduce:

1. Visit the website: http://en.wikipedia.org/wiki/mozilla
2. Tap press-hold on a selected word
3. Drag the right selection handle across multiple sentences in the paragraph 

Tested with:
Device: Tablet Asus Transformer TF 101
Firefox: Firefox 18 Beta 4


Actual results:

The selection action is delayed


Expected results:

The selection action should perform nearly live

Comment 1

[Ioana Chiorean]

I was able to reproduce this on same type table.
Here is a recorded video: http://www.youtube.com/watch?v=GgnKsjBxHbE

Comment 2

[Aaron Train [:aaronmt]]

Can this be profiled using Cleopatra?

Comment 3

[Teodora Vermesan]

I don't know what Cleopatra means. In this case, can you  link me to something?

Comment 4

[Aaron Train [:aaronmt]]

(In reply to Teodora Vermesan from comment #3)
> I don't know what Cleopatra means. In this case, can you  link me to
> something?

It's a question for Kats whom I cc'ed.

Comment 5

[Kartikaya Gupta (email:[e-mail])]

On the Galaxy Tab using an Aurora build I wasn't able to reproduce this on wikipedia but I did see it on news.google.com. I grabbed a profile, tail end of which can be seen here:

http://people.mozilla.com/~bgirard/cleopatra/#report=9fb89a6c1dff3bd00c4faf1025f38ecb068044a1

Looks like lots of sync reflows are being triggered by the mouse movement events that we use to implement text selection. I'd have to dig into it more to figure out what's actually going on here.

Comment 6

[Brad Lassey [:blassey] (use needinfo?)]

Brian, I think bug 667243 will make this better

Comment 7

[Aaron Train [:aaronmt]]

This is fixed via 667243 (still-WIP, testing available APK).

Comment 8

[:Margaret Leibovic]

This should be fixed by bug 667243.