MacOSX: CMD+SHIFT-LEFT/RIGHT selects the entire line. Fixes #3238

[ffissore]

/cc @Lauszus

[Lauszus]

@ffissore yes that solves it, but I also think it would be a good idea to add support for CMD+SHIFT+UP/DOWN while we are at it.

[ffissore]

@Lauszus what do CMD+SHIFT+UP/DOWN do?

[Lauszus]

It should select all text above and below the cursor respectively.

[ffissore]

It should already work. I'll knock a colleague and steal her mac

[ffissore]

Fixed. @ArduinoBot will prepare a build

[ArduinoBot]

Build successful. Please test this code using one of the following:
http://downloads.arduino.cc/javaide/pull_requests/arduino-PR-3239-BUILD-314-linux32.tar.xz
http://downloads.arduino.cc/javaide/pull_requests/arduino-PR-3239-BUILD-314-linux64.tar.xz
http://downloads.arduino.cc/javaide/pull_requests/arduino-PR-3239-BUILD-314-windows.zip
http://downloads.arduino.cc/javaide/pull_requests/arduino-PR-3239-BUILD-314-macosx.zip

[Lauszus]

Haha @ffissore it is not nice to steal ;)

Anyway it is still not working 100% correct.

I have taken a couple of screenshot in order to explain the current behaviour and what is wrong with it.

Cursor was moved to the end of the line and CMD+SHIFT+LEFT was pressed:

Then I pressed UP while still holding CMD+SHIFT, instead of continuing the selecting it starts from the cursor position instead:

This is how it should look like:

Note I got the last screenshot by manually selecting the text.

[Lauszus]

Btw is there anyway to just tell it to use the same behaviour as FN+SHIFT+ARROW, as it is working correctly?

[ffissore]

Keyboard mappings are defined in https://github.com/arduino/Arduino/blob/master/app/src/processing/app/syntax/SketchTextAreaDefaultInputMap.java and superclasses. I can't spot FN: I can only see shift, alt, cmd, ctrl.
I've merged this PR because, at least, the implemented behaviour is now more similar to the desired one