It looks like there's a bug in the window_copy_scroll_up and down functions where they don't correctly highlight what's been selected for copying.
To see the problem with window_copy_scroll_up, do the following: 1. Generate more than a screenful of text. 2. Enter copy mode. 3. Scroll up some so that you'll be able to scroll down later. 4. Move your cursor to the 3rd line from the top of the screen. 5. Begin your selection. 6. Move your cursor to the bottom of the screen. 7. Note that the first line of your selection is on line 3, and it is highlighted. 8. Scroll down 1 line. Notice that the first line of your selection is now on line 2, but it is no longer highlighted. It's still part of the selection, as a copy&paste will demonstrate. The problem with the highlighting appears to be that window_copy_scroll_up calls window_copy_write_line on the first 2 lines of the screen, and this removes the highlighting. A similar problem happens with window_copy_scroll_down. Continuing from the steps above: 9. Scroll down 2 lines. The first line of your selection is now 1 line above the top of the screen. 10. Scroll the window content down 2 lines (ctrl-y in vi mode). The first line of your selection is now back on the 2nd line and is highlighted, but so is the line above it, which is not part of the selection. I've attached a patch which corrects the behavior of both functions.
tmux-scroll.patch
Description: Binary data
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