Godot: Create a way to move all keyframes more easily (E.g Adding a keyframe at the numbers of the TimeLine)

[DrZanuff]

Godot 3.0.2 Stable

Windows 10 Home 64 Bits

Issue description:
I would like to suggest to insert a keyframe in the TimeLine to move all keyframes at same row. Currently you have to drag to select all keyframes, and if you have a lot of keyframes this become troublesome:

In DragonBones, a Skeleton Animation 2D tool, you can drag a keyframe at the timeline to move all keyframes of the same row:

I worked in a long animation on Godot, and this feature would've helped a lot.

[Zylann]

We could also have a "ripple editing" mode, it's a nice idea I've seen and used in Reaper timelines: basically when this is enabled, moving an item will also move all items coming at the same time or after it. It makes it easy to insert or remove some duration in the animation without having to manually select everything.

[DrZanuff]

I liked the idea of the ripple editing. This would help too.

[avencherus]

Yes, the AnimationPlayer could use some more bells and whistles for manipulating and selecting keyframes. It gets cumbersome for animators once the tracks reach a certain number.

[takhimi]

@DrZanuff , I agreed with you. Is there a way to do this right now(Godot 3.1.1 or in next release ? In Spriter it works the same way as Dragonbones or the same way as DrZanuff demoed. Ability to manipulate or move, select or delete all keyframes from timeline would be great instead of needing to select every keyframe per track. Please add this feature...

[holzmb]

In 3.2 you can't even move the scrollbar with the selection, like in the first gif.
You can only select keyframes that are on the screen, making the animation extremely cumbersome.
Anyone know if ripple editing would be possible to make with a plugin?

[akien-mga]

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