Dialogue Editor is slow to type in for large projects

[nstryder]

Hello, I run a large project with thousands of files. This causes saving to be much slower than the average project.
I was wondering if the editor auto-saves upon entering any text. If so, this might be the cause of the performance issues. The option to turn off auto-save and have a manual save button would be a simple solution I think.

I tested it again with a fresh minimal project, and the slowdown does not happen there.

Attached is a video demonstrating the slowdown. Under Godot's code editor, input is smooth, but in the Dialogue tab, it is slow to enter anything.

2022-03-07.20-07-49_edit.mp4

[nathanhoad]

I've moved the code that was constantly saving the dialogue resource out into a proper apply_changes() method. That should make things better.