Prevent Follow TCP from freezing when switching streams

[NghiaTranUIT]

Problem

• The Follow TCP window can freeze for several seconds after moving to the next or previous stream.
• This happens more often when the stream contains a large amount of text or one very long line.
• Moving the mouse over the transcript can make the app prepare the full text, including content outside the visible area.
• The work runs on the main app thread, so the window stops responding until it finishes.

Solution

• Prepare only the part of the transcript that is visible on screen.
• Do not prepare text that is outside the visible area until the user scrolls to it.
• Keep the loading view visible while a new stream is being prepared.
• Use simple left-to-right character wrapping for network text to avoid slow text direction checks.
• Find the hovered packet with a fast lookup instead of checking every packet.

Expected result

• Switching TCP streams should remain responsive.
• Hovering a transcript row should show the Show Packet button without freezing the app.
• Large streams should load safely without blocking the window for several seconds.

[NghiaTranUIT]

https://tcpviewer.proxyman.com/docs/features/follow-tcp-stream