Swiping to dismiss full-height bottom sheet causes full-height set for subsequent bottom sheet

[dcalhoun]

Describe the bug
When dismissing a full-height bottom sheet (e.g. link picker in #23922) by swiping downward or tapping the overlay, rather than tapping the cancel/back button, the full-height styling is then erroneously applied to the next bottom sheet opened. This was discovered while building #25810, as it also occurs for the full-height focal point picker.

To reproduce

1. Launch content editor.
2. Insert Paragraph block.
3. Tap the Link button to insert a link.
4. Tap "Link to" to set URL.
5. Swipe down to dismiss the bottom sheet OR in landscape orientation tap the overlay outside the bottom sheet.
6. Tap the Link button to insert a link.

Expected behavior
When opening the Link bottom sheet the second time it should not display at full-height of the display, but should only take up the bottom portion of the display.

Screenshots

Details

Expected	Actual

Interactions

RPReplay_Final1610545956.mp4

Editor version (please complete the following information):

• WordPress version: 5.6
• Does the website have the Gutenberg plugin installed, or is it using the block editor that comes by default?: default
• If the Gutenberg plugin is installed, which version is it?: 9.6.2

Smartphone (please complete the following information):

• Device: iPhone 11 Pro
• OS: 14.3
• WordPress App Version: 16.3

[dcalhoun]

After playing with this problem, I wonder if an appropriate solution would be to "reset" the full-height status within the clean-up function of the useFocusEffect. From testing, this does work. My only concern would be if it causes any performance degradation, as I haven't fully come to understand the bottom sheet architecture.

useFocusEffect(
  useCallback(() => {
    // ...existing logic...
    return () => {
      setIsFullScreen(false);
    };
  })
);

[geriux]

Thanks for creating this issue @dcalhoun! Maybe @dratwas can give some insight regarding the bottom sheet architecture and your possible fix from above.

[dcalhoun]

@dratwas following up to see if you have any thoughts on my proposed fix. No need to deep dive into the issue, just curious of your initial reaction.