JetBrains: Add initial web view modal setup (!34435) · Merge requests · Administrator / sourcegraph

Created by: philipp-spiess

This is the first PR to merge back our prototype changes from ps/jetbrains-demo into main. In this PR we:

Change the keybind for the current open file action
- Not sure if this is good or bad but I've gotten used to alt + a for opening the modal. I figured that if we have users that are used to alt + a for the old behavior they now get a free reminder of our new features when they update :P I've changed the existing keybind to alt + shift + a.
Create the base setup to load a modal view with a split screen of web view + editor.
Create a service to hold the reference to the web view so that we can reuse it when the modal is closed?
Add the basic scheme handler to load files from the resources folder. For now this supports .html, .css, and .js.

cc @madppiper (I can't tag you for review directly 😢 )

Known issues

There's a quick white flash when the web view is loaded the first time.
You can open more than one popover by pressing alt + a multiple times (this should probably not do anything when the modal is still shown).

Verified manually on macOS AArch64: