#4082 Windows 10: NPE in sun.awt.windows.WInputMethod on main view focus change

[Makarius]

This is jEdit 5.5.0 on Windows 10 with Java 8u181 or OpenJDK 11.0.3+7 (from adoptopenjdk.net).

Start jEdit regularly, e.g. via "java -jar jedit.jar"; switch to another window; click into the main jEdit view to reactive its focus. Each time this happens, there is an NPE in sun.awt.windows.WInputMethod (see the included log file).

My impression is that it only happens on relatively recent Windows 10. Activation of a dockable jEdit window (not main view) does not have this effect.

[Björn Kautler]

This is fixed now.
The problem was, that our IMF support did return null where it was not supposed to do so. (Besides that the calculations were done wrongly)