Thank you for you questions.
Yes, you're right. I have focus in left or right side.
When pressing Ctrl + G a small window is shown with two controls: textbox to enter line of code (which is focuced) and radiobutton with two options: left pane, right pane.
For Unified view: if user wants to go to number of code of a left file than he checks "left pane"-option in the radiobutton .
For "Side by side" mode, "left pane/right pane"-options in radiobutton are automatically set by a current position of a cursor: if left pane has active cursor than "left pane"-option is choosen upon Ctrl + G little window.
If this line is hidden 10 rows should be shown (the same behavior when user clicks Show-button on a hidden text).

everything with a configurable shortcut