I use Flex for the majority of my Flash related work, even for writing plain ActionScript. Lately I've barely even used the Flash authoring environment to create stuff. When I do use the Flash authoring environment, it's mostly for automation and prep work of content. If you are like me, you write JSFL to do that stuff.

I love automating redundant tasks. One thing that bugs me when importing graphical assets to Flash's stage is having to resize the document to what I imported. I like that I can do this by going to the Document Properties and setting the document to match the content size, but if I have to do this each time I import/export content it becomes a irksome chore. I write JSFL scripts that run tasks on multiple files, having a "match contents" function would be useful to me in my case...maybe to you as well. I do not see a JSFL way to do this. (Maybe there is and I had a brain fart?). Until then, here is a script I wrote to do it in JSFL...
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If you use Photoshop you probably appreciate the "Constrain Proportions" checkbox found in some of the application's dialogs and menus.

I like to have this same ability when I'm writing ActionScript to resize objects proportionately too.
Here I use the functions to set the sizes so when I set width, height is changed accordingly.
The same for setting height, the width is changed accordingly.

*Note: I set the inputs to limit the width and height to 500.

Here are two functions for performing proportional resizing by both width and height...
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