fix(lsp): handle relative='editor' in make_floating_popup_options() #39320

Problem:  With `vim.g.health = { style = 'float' }`, running
          `:checkhealth` from a `:help` buffer placed the float in the
          top-left corner instead of centered.
          make_floating_popup_options() picks the NW/NE/SW/SE anchor
          and the available height from cursor-relative metrics
          (winline(), wincol(), winheight()). When the caller passes
          relative='editor', those metrics are meaningless, so the
          function could flip to an 'E' anchor and clamp the float
          off-screen.
Solution: When relative='editor', treat the whole editor area as
          available space (lines_above=0, lines_below=&lines,
          wincol=0). This makes the NW anchor the natural choice and
          keeps the float position stable regardless of where the
          cursor is in the current window.

AI-assisted: Claude Code

0 files changed, 0 insertions, 0 deletions