fix: update workaround preventing React Native from hiding frozen screens to work with RN 0.78

[kligarski]

Description

React Native sets display: 'none' for frozen screens - this behavior can become an issue, if you for example press back button twice very fast on iOS - frozen screen might still be invisible. The problem and its workaround suggested by @grahammendick can be seen in issue #1207. The workaround was introduced in PR #1208.

Recently, React Native 0.78 has changed the way of diffing props and the workaround stopped working. The details and a new workaround has been suggested by @grahammendick once again in issue #2753 and PR grahammendick/navigation#860.

This PR introduces the suggested workaround.

A big thank you to @grahammendick for figuring it out and suggesting the solution once again, appreciate it!

Furthermore, the new workaround fixes a bug with back button on the screen stack header on iOS. The bug was probably introduced with the update to 0.78. The back button would disappear and then reappear after a short delay with generic "Back" label instead of the screen name.

before_2778.mp4

after_2778.mp4

Fixes #2753.

Changes

• change display: false to display: null,
• change ViewConfig interface to allow null value.

Tests

Run TestFreeze example, click Go to Details twice and then click the back button in the header. The button behaves as expected, which was not the case before - the button would disappear and then reappear with a generic "Back" title.

Checklist

• Updated TS types
• Ensured that CI passes

[grahammendick]

Nice. You're welcome 👍

[kkafar]

Looks great, thanks!