I understand very well that I want to open the material simply using the keyboard.
I can think of 2 solutions:
1: CTRL + SHIFT + R (select the file as usual), then (still in the Open Resource dialog box) TAB, TAB, ENTER, and then press the down arrow key until you get the correct editor
2: turn on the Project Link switch 'Link with Editor' (the button in the upper right corner of the Project Explorer View window)
Now you can easily get from the file opened in the editor to the right place in the Project Explorer view (so you can right-click it).
Hope this helps! (I also find CTRL + F7 a useful way to jump to the Project Explorer view from the editor)
Matt
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