Hi Ahmed,
I recommend that you use the standard text editing shortcuts.
To select text from the cursor till the start of the current line:
<Shift> + <Home>
To select text from the cursor till the top of a script:
<Crtl> + <Shift> + <Home>
To select text from the cursor till the end of the current line:
<Shift> + <End>
To select text from the cursor till the bottom of a script:
<Crtl> + <Shift> + <End>
To select text upward from the cursor position:
<Shift> + <UpArrow>
To select text downward from the cursor position:
<Shift> + <DownArrow>
