Merging of InternetExplorerOptions doesn't work

[JohnA2]

🐛 Bug Report

This is a follow up for #5279 as requested in #5279 (comment)

To Reproduce

Use InternetExplorerOptions.merge()

Expected behavior

Browser specific parameters in descendants of MutableCapabilities work after merging them.

Test script or set of commands reproducing this issue

InternetExplorerOptions options1 = new InternetExplorerOptions();
InternetExplorerOptions options2 = new InternetExplorerOptions();
options1.useCreateProcessApiToLaunchIe().addCommandSwitches("-private");
options1.merge(options2);
WebDriver driver = new InternetExplorerDriver(options1); // IE doesn't start in private mode

Environment

OS: Windows (any version)
Browser: Internet Explorer
Browser version: 11
Browser Driver version: IEDriver 3.150.1
Language Bindings version: Java 4.0.0-alpha-7

[JohnA2]

@barancev So the above test code now works correctly in beta-1, but the reverse merge combination (if you replace options1 with options2 on line 3 of my code) that worked in alpha-7 is now broken.

[barancev]

merge method does not modify the object it is called in, it creates a new object that contains merged data.

[JohnA2]

ok. Still, this code doesn't work:

InternetExplorerOptions options1 = new InternetExplorerOptions();
InternetExplorerOptions options2 = new InternetExplorerOptions();
options2.useCreateProcessApiToLaunchIe().addCommandSwitches("-private");
InternetExplorerOptions options3 = options2.merge(options1);
WebDriver driver = new InternetExplorerDriver(options3); // IE doesn't start in private mode

[barancev]

A better fix provided by commit 0da772d