since electron tray doesn't support double click on linux, open on single click there

Author: shawnc722

src/main/base/app.ts

@@ -280,7 +280,7 @@ export class AppEvents {
     this.tray.setToolTip(app.getName());
     this.setTray(false);
 
-    this.tray.on("double-click", () => {
+    this.tray.on("double-click", () => {  // supports windows and mac only
       if (utils.getWindow()) {
         if (utils.getWindow().isVisible()) {
           utils.getWindow().focus();
@@ -290,6 +290,16 @@ export class AppEvents {
       }
     });
 
+    this.tray.on("click", () => {
+      if (utils.getWindow() && process.platform === "linux") {  // use single click to open when double doesn't work
+        if (utils.getWindow().isVisible()) {
+          utils.getWindow().focus();
+        } else {
+          utils.getWindow().show();
+        }
+      }
+    });
+
     utils.getWindow().on("show", () => {
       this.setTray(true);
     });