I believe I've tested all possible scenarios how to select a text to copy it to clipboard afterwards. My tests were:
- mouse only selection (left->right, up->down)
- mouse only selection (right->left, down->up)
- keyboard only selection (left->right, up->down)
-- with keys shift+right/down/end/pgdown, shift+ctrl+right/down/end/pgdown
- keyboard only selection (right->left, down->up)
-- with keys shift+left/up/home/pgup, shift+ctrl+left/up/home/pgup
- shift+mouse-click