Enhancement: Click margin to select current line

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Type line 1 Enter
2. Type Line 2 Enter
3. Click margin on line 1

What is the expected output? What do you see instead?
Expect to select the whole line like Notepad++, Sublime,...but see nothing


What version of the product are you using? On what operating system?
Notepas 0.9.41, Windows 7 64bits

Please provide any additional information below.
Click line margin should select the whole line (so user can delete or edit the 
whole line quickly). It will make notepas better!

Original issue reported on code.google.com by [email protected] on 2 Feb 2015 at 10:33

[beNative]

Good idea, I will add this feature.