Custom board menu selection reverts to default on new window open

[per1234]

Describe the problem

For the convenience of the user, Arduino IDE automatically configures the board and port selection of a new IDE window according to the configuration of the previous window.

In addition to the primary board selection, some board definitions have "custom board options" that allow additional configuration via arbitrary submenus added under the Tools menu.

🐛 The configuration of the custom board options revert to the default values when a new window is opened.

To reproduce

1. Select Tools > Board > Arduino AVR Boards > Arduino Nano from the Arduino IDE menus.
2. Select Tools > Processor > ATmega168 from the Arduino IDE menus.
3. Select File > New Sketch from the Arduino IDE menus.
   A new window will open.
4. Open the Tools menu in the new window.
   🐛 The default ATmega328P option is selected in the Tools > Processor custom board option menu.
5. Select Tools > Processor > ATmega168 from the Arduino IDE menus.
   Select File > Save As... from the Arduino IDE menus.
6. Save the sketch to any name and location.
7. Open the Tools menu in the new window.
   🐛 The default ATmega328P option is selected in the Tools > Processor custom board option menu.

Expected behavior

The custom board options configuration from the parent window are used in new windows.

Arduino IDE version

69b7365

Operating system

Windows

Operating system version

11

Additional context

The behavior described here was introduced at ce02e26 / #2241.

The described behavior does not occur when using the IDE build from ed2d8ad or earlier (but note those versions had a related fault #2240).

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Originally reported by @mjs513 at https://forum.arduino.cc/t/is-there-a-m4-and-m7-usage-for-dummies-document-d/1180371/10

Additional reports

• Custom board menu selection reverts to default on new window open #2271 (comment)
• https://forum.arduino.cc/t/arduino-ide-2-2-1-with-arduino-giga-dual-core-issues/1181384/4

Issue checklist

• I searched for previous reports in the issue tracker
• I verified the problem still occurs when using the latest nightly build
• My report contains all necessary details

[frankcohen]

+1 on changing the behavior. The options revert to default values when opening new sketches, in addition to non-standard boards.