Scroll down/up scrolls down twice

[liavassif]

Description of your problem

Scroll down/up performs two consecutive calls to scroll instead of a single one

What steps will reproduce the problem?

1. Place the cursor on the first line of a file in the editor pane
2. Press scroll down (PageDown key)

What is the expected output? What do you see instead?
The cursor should be at line 26 (assuming the scroll is 25 lines), but instead it is at line 52

Please provide any additional information below

Versions and main components

• Spyder Version:3.2.0dev (3.x branch) and 4.0.0dev (master)
• Python Version:3.5.2
• Qt Version:5.6.2
• PyQt Version:5.6
• Operating system:Linux

Dependencies

Please go to the menu entry Help > Optional Dependencies (or
Help > Dependencies), press the button Copy to clipboard
and paste the contents below:

[rlaverde]

This is caused by this change 738f8e1#diff-b19a1c3b49c9057f7bf2edae2a53747dR2710 keyPressEvent is called twice (at keyPressEvent and also at keyReleaseEvent)

Should it be super(CodeEditor, self).KeyReleaseEvent(event)?

@goanpeca

[ccordoba12]

@rlaverde, please work on this one.