If we build an editor in a hidden container (i.e.: div) an error occurs in fck_gecko.js (line 206 rv:666)

[Bossaer Olivier]

I load an editor on the fly (JS) when a user press "edit" button, the editor is loaded in a hidden div; when fckEditor is fully loaded I simply show it. It works fine, but with my last subversion update I've got a strange error with fck_gecko.js
sel has no properties (fck_gecko.js line 206)

if (sel.rangeCount < 1 )return;

This bug comes only if my div is invisible, to work arround I've modified the if statement in this way:
if (!sel || sel.rangeCount < 1 )return;
All looks fine now, but I don't know the real reason why this error come now and not in previous version (rv: 650 did not have this issue).

Olivier

[Bossaer Olivier]

Test case

[Martin Kou]

Fixed with [671].

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