[PATCH] Fix out-of-bounds read in tui_addr_is_displayed

[Bogdan Harjoc]

In tui_addr_is_displayed(), if win_info->content.size() is less than 2, then

  win_info->content.size () - threshold

will wrap to SIZE_MAX if threshold = SCROLL_THRESHOLD = 2.

The attached patch avoids calling win_info->content[i] below with i=0
which is past the end of the vector of size 0.

Bogdan
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