main: do not lower priority of rendering when in background

This prevents rendering getting slow when switching to other
applications while installing, which results in the installer
interacting with the device while GUI is trying to catch up
with the installation process.

Change-Id: I201defba33d76322d3405d254b7a4b6ba3530bd1
Signed-off-by: Alexander Martinz <amartinz@shiftphones.com>

src/main.js

@@ -29,6 +29,12 @@ const reporter = require("./lib/reporter.js");
 const menuManager = require("./lib/menuManager.js");
 const core = require("./core/core.js");
 
+// Do not lower priority of rendering when in background
+// - See: https://www.electronjs.org/de/docs/latest/api/command-line-switches#--disable-renderer-backgrounding
+if (typeof app.commandLine !== "undefined") {
+  app.commandLine.appendSwitch("disable-renderer-backgrounding");
+}
+
 // Enable live reload for Electron
 if (process.env.ROLLUP_WATCH) {
   require("electron-reload")(path.resolve("./public"), {