Allow users to pass --enable/disable-features flag (Vencord#527)

Previously they would be overwritten by vesktop

src/main/index.ts

@@ -27,10 +27,13 @@ process.env.VENCORD_USER_DATA_DIR = DATA_DIR;
 function init() {
     const { disableSmoothScroll, hardwareAcceleration } = Settings.store;
 
+    const enabledFeatures = app.commandLine.getSwitchValue("enable-features").split(",");
+    const disabledFeatures = app.commandLine.getSwitchValue("disable-features").split(",");
+
     if (hardwareAcceleration === false) {
         app.disableHardwareAcceleration();
     } else {
-        app.commandLine.appendSwitch("enable-features", "VaapiVideoDecodeLinuxGL,VaapiVideoEncoder,VaapiVideoDecoder");
+        enabledFeatures.push("VaapiVideoDecodeLinuxGL", "VaapiVideoEncoder", "VaapiVideoDecoder");
     }
 
     if (disableSmoothScroll) {
@@ -43,11 +46,16 @@ function init() {
     // HardwareMediaKeyHandling,MediaSessionService: Prevent Discord from registering as a media service.
     //
     // WidgetLayering (Vencord Added): Fix DevTools context menus https://github.com/electron/electron/issues/38790
-    app.commandLine.appendSwitch(
-        "disable-features",
-        "WinRetrieveSuggestionsOnlyOnDemand,HardwareMediaKeyHandling,MediaSessionService,WidgetLayering"
+    disabledFeatures.push(
+        "WinRetrieveSuggestionsOnlyOnDemand",
+        "HardwareMediaKeyHandling",
+        "MediaSessionService",
+        "WidgetLayering"
     );
 
+    app.commandLine.appendSwitch("enable-features", [...new Set(enabledFeatures)].filter(Boolean).join(","));
+    app.commandLine.appendSwitch("disable-features", [...new Set(disabledFeatures)].filter(Boolean).join(","));
+
     // In the Flatpak on SteamOS the theme is detected as light, but SteamOS only has a dark mode, so we just override it
     if (isDeckGameMode) nativeTheme.themeSource = "dark";