[BUG] Release 2.6.3 cannot close window when clicking close window/alt+f4 for a large .md file

[MARJORIESHA-pBAD]

Describe the bug
The app window cannot be closed when pressing close window button/alt+f4 occasionally occuring for previewing large MD files. The issue was found on new release Markpad_2.6.3_x64.exe and Markpad_2.6.3_installer_x64.exe.
To Reproduce

1. Open ALargePureTextMarkdownFile.md using "Open with Markpad"
2. Scroll down for a while in the preview mode.
3. Click on the exit button on top-right of the markpad app window or press alt+f4
4. The app will not be closed in some cases. Needed a taskill to terminate the process.

Expected behavior
The app window should shutdown.

Device

• OS: Window 11 Pro
• Version: 10.0.26200 Build 26200
• App Version: 2.6.3

[alecdotdev]

fixed! slated for next release.
large files also load much quicker, and title bar wont get blocked by tab activity!