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Thread: [CLOSED][3.1.1] Odd shadow on combo box's dropdown list in IE7

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  1. #1
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    Default [CLOSED][3.1.1] Odd shadow on combo box's dropdown list in IE7

    We have a combo box whose store contains 376 items. When you click the combo box's down arrow, in IE 7 and only one some machines, a weird shadow appears above and to the left of the dropdown list. See attached screenshot. If we reduce the number of items to about 200 the problem doesn't occur.

    When the shadow appears, a similar shadow will then appear intermittently for tooltips, other combos, the Calendar control, etc. etc. Closing IE or doing Ctrl+F5 will clear the problem.

    Note: the behaviour of this 'artifact' is very odd, fairly machine dependent, and easily avoided by not having so many items in the combo's store. We will solve this by reducing the number of items. I don't expect a fix from you, but I thought I'd better report it.
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  2. #2
    Sencha User Condor's Avatar
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    You are not the first one to report this, but I haven't been able to reproduce the problem locally.

    It looks like IE somehow kills alpha-channel transparency when the combobox list is too high.

  3. #3
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    Default ATI graphics cards

    FWIF it affects our machines that have ATI Radeon X1650 graphics cards.

  4. #4
    Sencha User Condor's Avatar
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    Wow! A browser rendering problem caused by a faulty graphics driver. That's a first.

  5. #5
    Sencha User Jamie Avins's Avatar
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    Nice catch.

  6. #6
    Sencha User VinylFox's Avatar
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    Code:
    <!--[IF GPU EQ ATI Radeon X1650]>
    .x-shadow .xstl, .x-shadow .xstc, .x-shadow .xstr, .x-shadow .xsbl, .x-shadow .xsbc, .x-shadow .xsbr {
        background-image: none !important;
    }
    <![ENDIF]-->

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