Replace option in the contextual menu

Maybe if we added a drag and drop modifier key, dropping a clip from the list of imported files to an existing clip while holding a certain modifier key will replace that clip's file with the one that was dragged on to it. Just a suggestion

From #596224:

Usage scenario: Imagine creating a set of videos where the introduction is, for the most part, the same. The introduction, however, changes ever-so-slightly from one video in the set to the next. (For example, one video might animate the word "Basic" while another video animates the word "Intermediate" -- the rest of the introduction, animations, fades, etc., would remain the same.)

It would be easier if you could create the new file (e.g., "intermediate.png") and simply redirect the elements in the existing track to use the new file.

In my case, I have six different uses of the word "basic" but want the animation to remain the same for all six cases (slide in from left, slide out to right, fade in, fade out, etc.) regardless of the word ("basic", "intermediate", "advanced", etc.). This means that I have to remove the "basic.png" six times, then carefully align and configure "intermediate.png" six times to replace "basic.png".

How about just letting the person type in a new name in the properties dialog? Make the field beside, "File Name:" an input field (or a button for a File/Open dialog, or both). Drag & drop would be cool, too, but not as self-evident.

What is most likely - replacing with a new file, or a file already in the project?

If the person replaces media with a new file, then add that file to the project.

If the person replaces media using a file that already exists in the project, then don't add it to the project.

The less work and thought for the user, the better: adding the file to the project before you can use it is more work than just being able to select a file for replacement.

This has been merged from Andy's branch, and is committed to the trunk now. Thanks Andy! I modified the code some to change the IN, OUT, and Length settings, in-case the files are different lengths.

Ahh, yes, good idea!