Not able to switch to Internal Text Editor when searching

In short: I am not able to switch to Internal Text Editor from main window or another program when the search window is open in the text editor. This applies both to taskbar and Alt+Tab, but not Win+Tab.

OS: Win7 Pro
Version: WinSCP 4.3.2 (Build 1201), Commander

Steps to reproduce:
1 Start a session
2 Open a text file in the remote session by right clicking and choosing Edit
3 Open search window in the Internal Text Editor (e.g. by Ctrl+F)
4 Switch (e.g. by Alt+Tab) to main WinSCP window
5 Try to switch back to Internal Text Editor, by Alt+Tab or using the taskbar.

Actual result: It is not possible to switch back to Internal Text Editor.

Expected result: It should be possible to switch back.

I'm not posting session log file as it seems irrelevant.

Thanks for your post. This issue has been added to tracker.

Thank you!