fix(lsp): minimum height for floating popup #31990

Problem:
The floating window for hover and signature help always cuts off a few lines,
because the `_make_floating_popup_size` function counts empty lines as having
zero height.

Solution:
Ensure the height is at least 1.

1 files changed, 13 insertions, 0 deletions

diff --git a/test/functional/plugin/lsp_spec.lua b/test/functional/plugin/lsp_spec.lua
index 9cefe96e79..5e9766c784 100644
--- a/test/functional/plugin/lsp_spec.lua
+++ b/test/functional/plugin/lsp_spec.lua
@@ -3501,6 +3501,19 @@ describe('LSP', function()
         end)
       )
     end)
+    it('handles empty line', function()
+      exec_lua(function()
+        _G.contents = {
+          '',
+        }
+      end)
+      eq(
+        { 20, 1 },
+        exec_lua(function()
+          return { vim.lsp.util._make_floating_popup_size(_G.contents, { width = 20 }) }
+        end)
+      )
+    end)
   end)
 
   describe('lsp.util.trim.trim_empty_lines', function()