[PATCH] Display log messages with log levels `warn` and higher in the console

[floscher]

Current behaviour (since r14052)
Only log messages of exactly INFORMATION are displayed in the console, log levels WARN and ERROR are hidden.

Desired behaviour
All log messages of the current log level or higher levels are displayed

Cause
The new class ReacquiringConsoleHandler extends ConsoleHandler and implicitly calls the superconstructor. The superconstructor initializes the output stream with System.err.
If ReacquiringConsoleHandler is now instantiated with a different OutputStream the method ConsoleHandler.setOutputStream() will flush and close System.err. Since log levels WARNING and higher are output to System.err, this prevents log messages for those log levels from appearing.

Solution
Let the method ReacquiringConsoleHandler.setOutputStream() do nothing as long as the superconstructor has not completed.

[floscher]

Avoid closing System.err stream in ReaquiringConsoleHandler. Logging messages of warning level or higher levels were prevented from displaying since r14052.

[ris]

Neat solution. Should have had a test for the console behaviour to catch this.

[Don-vip]

In 14070/josm:

fix #16547 - Display log messages with log levels warn and higher in the console (patch by floscher)

[Don-vip]

In 14073/josm:

see #16547 - fix PMD warning