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Flash Builder 4 suddenly stops doing autocomplete for some classes

The project that we have been working on for several weeks in Flash Builder suddenly ceases to be navigable: all the nice features of Flash Builder, such as autocomplete, transition to definition, even search for links, only partially work - they work for some classes, but not for others. I tried to restart Flash Builder by closing and opening the project, re-creating the project, but this bad situation persists. Moreover, this happened at about the same time for 2 other developers in the same project, each of which has a slightly different configuration. It seems that we have exceeded some internal limit of FlashBuilder, but our project is not yet so large. I am not sure where I can find to fix this problem.

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Normally closing and restarting Eclipse solves the problem for me. But, here are a few more things you can try:

  • Since this happened on three workstations, on a discrete set of classes, were you looking for a strange or non-standard syntax error? I am sure that I have seen situations where something does not cause a compiler error, but does not cause code breaks. I would look for things like single quotes inside double quotes or ASDocs that were not properly completed. [It seems wildly inconsistent, though, so it's a bit of a blow in the dark].
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<fx:Model id="testTextFlow">
    <flow:TextFlow version='3.0.0' xmlns:flow='http://ns.adobe.com/textLayout/2008' fontSize='11' 
        textIndent='10' paragraphSpaceBefore='6' paddingTop='8' paddingLeft='8' paddingRight='8'>
        <flow:p paragraphSpaceBefore='inherit' clearFloats='start'>
        <flow:img source="http://imgs.xkcd.com/comics/trapped.png" width="600" height="300" float="right"/>
        <flow:span>Bacon ipsum. Permanent link to this comic: http://xkcd.com/876/ Image URL (for hotlinking/embedding): http://imgs.xkcd.com/comics/trapped.png</flow:span>
        <flow:TextFlow version='3.0.0' xmlns:flow='http://ns.adobe.com/textLayout/2008' fontSize='15'>  
        <flow:p paragraphSpaceBefore='inherit' >Here is an embedded text flow.</flow:p>
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I also noticed that it opens a strange second class where the code hint does not work when you click on the hyperlink to this class from another class. If you double-click the "Class.as" file in the document tree, then it works fine. Very strange

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