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Then you'll be happy to know that Adobe *does* use Qt in some of their products:

http://trolltech.com/company/customers/coolapps/adobe

Maybe they are clever enough, but one can not port a whole codebase overnight. Or maybe the evaluated Qt, but concluded that it is not OK for all of their products.

But you're ignoring the main advantage which Adobe has over other products on the market - Adobe has the whole work flow of products under the one roof. From photo editing to website and content creation - and everything in between; it is a formidable package. Simply porting one piece of software will not help in the slightest. It would be like getting sold a car and when it arrives - all you have are 4 wheels.

What there needs to be is an eccentric billionaire who can dedicate $2billion to re-creating the whole Adobe chain of products using Qt. This is why Quark has continued to loose its position in the market; the failure to realise that no one *cares* about purchasing one application from one vendor, and then pray that all 5 different titles from five different vendors will hopefully work together. People want a completely integrated solution from the top downwards.

Personally, I think that the open source world could do a lot better job than Adobe if it got its act together. For example, why not have one common engine sitting at the core of a whole line of products? a set of core libraries on which products can be built - taking the parts of each library that are relevant to the given application and implement them. It would reduce to the over lap between different applications and ensure a consistent presentation each step along the way.

Quark has sufferet from being underdeveloped.
InDesign was simply *better*, not only better integrated.

Now the Quark fixes this, but I think they're too late.

As for integration: The new Quark has integration up to par with InDesign.

That being said: I Agree with you for the most part.