Fixed Video Player Crash and late initialization errors in flutter test

[badnikhil]

…Flutter tests.

PR Description

This PR addresses an issue where the Video Previewer widget was crashing during UI updates, such as tab switching, window resizing, or other state changes.

the Video Previewer widget was getting disposed when switching tabs, resizing the window, or performing similar UI updates. However, when the widget received an update after being removed from the widget tree, it caused an application crash.

For example

Switching to "Headers" and then back to "Response Body" led to a crash.

When resizing the window, video reinitialization was expected, but it didn’t happen, leading to unexpected behavior.

I identified the issue and successfully fixed it by preventing unnecessary disposals, ensuring smooth transitions without crashes.

Related Issues

• Closes Fix video player crash #627
• Fixes the late initialization error in issue Errors Encountered During Flutter Tests #646

Fix Implemented:

• Prevented video controller disposal crashes by pausing instead of disposing when the widget tree updates.
• Fixed the LateInitializationError related to _videoController by handling initialization.

Checklist

• I have gone through the contributing guide
• I have updated my branch and synced it with the project main branch before making this PR
• I am using the latest Flutter stable branch (flutter upgrade verified)
• I have run the tests (flutter test) and all tests are passing
  • ⚠️ A Test is failing due to an issue in a package dependency not the project codebase.
    (As mentioned in issue Errors Encountered During Flutter Tests #646 )

Added/updated tests?

• Yes
• No, and this is why: Not needed for this fix

OS on which you have developed and tested the feature?

• Windows
• Android / iOS
• macOS
• Linux