idea #570: Collapse long strips for easy editing

When you edit video files you often end up with long strips that have many thousand frames. To make it easier to handle these strips you can scale the sequence editor but when you need to do short blends. Like a gamma cross fade for about 1-2 secs you have to zoom in which often results in a lot of scrolling.
It would be nice if it was possible to replac the long strips with a proxy block that still resembles the original block but is only as wide as needed for the effects put upon it no mater what zoom level you are on.
The sequencer timeline would still show the correct frames for the end and the beginning.
You can work on them like a normal strip only that all operations are mapped to the true length of the block.
Like when you edit metastrips you can also tab into these proxy strips to edit the original frames.

Example: you have two video files each being 12400 frames long. When you replace them with a proxy you only see two blocks that are approximatley 2sec in length each. The timeline shows that the first proxy starts at frame 1while the second proxy starts at 12400 the end of the first proxy block.

Hope this makes sense.

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