Watch open files for updates and auto-update to latest versions when changed externally

[aral]

The problem

Say I have (knowingly or unknowingly) File A open in two different instances of Helix – Editor X and Y.

File A:

1. hello
2. goodbye

1. I change line 1 in File A in Editor X To 1. hi and save it (:w)
2. I look at Editor Y, line 1 still reads 1. hello.
3. If in Editor Y, I change line 2 to 2. bye and save, I’ve overwritten the change in Editor X.

How other editors handle it

Editors (e.g., VSCode) handle this by watching open files for changes. If a change is detected, the file in the editor is automatically updated to the latest version from disk.

[archseer]

Duplicate of #1125