Keyboard test area in Input preflet should clean itself while receiving focus

[TheClue]

When the user switches between the various devices in Input preflet, from keyboards to others and vice versa, I see that the content of the testing textfield is preserved.

I think this is useless and aestetically bad; IMHO it should clean itself to the default content.

Additionally, I think thart the default content should be cleared when the user gives the focus on the area. This is to give him a clear, blank area, to type into.

[pulkomandy]

Normally the text is supposed to be selected, so when you type something, it replaces it. But apparently this isn't the case anymore.

[X512]

I prefer current behavior, no special handling is needed. Also user may type something useful in this field to copy it somewhere, so it would be confusing if text will disappear.

[TheClue]

I don't think we should allow the user to use the keyboard test area to write down something "useful", this is not the intended use for the preflet. It's not practical. Let alone it could be annoying and defocusing for the user (more clicks on avg. to perform the intended action)

[X512]

When user see edit control, he expect specific behavior and its annoying if behavior change unexpectedly. Pressing Alt+A can be used to replace current content.