feat(lsp): overwrite omnifunc/tagfunc set by ftplugin #22267

Problem:
Some built-in ftplugins set omnifunc/tagfunc/formatexpr which causes
lsp.lua:set_defaults() to skip setup of defaults for those filetypes.
For example the C++ ftplugin has:
    omnifunc=ccomplete#Complete
          Last set from /usr/share/nvim/runtime/ftplugin/c.vim line 30
so the changes done in #95c65a6b221fe6e1cf91e8322e7d7571dc511a71
will always be skipped for C++ files.

Solution:
Overwrite omnifunc/tagfunc/formatexpr options that were set by stock
ftplugin.

Fixes #21001

1 files changed, 17 insertions, 0 deletions

diff --git a/test/functional/fixtures/fake-lsp-server.lua b/test/functional/fixtures/fake-lsp-server.lua
index dbb66a42e8..9cc2f6fa27 100644
--- a/test/functional/fixtures/fake-lsp-server.lua
+++ b/test/functional/fixtures/fake-lsp-server.lua
@@ -932,6 +932,23 @@ function tests.basic_formatting()
   }
 end
 
+function tests.set_defaults_all_capabilities()
+  skeleton {
+    on_init = function(_)
+      return {
+        capabilities = {
+          definitionProvider = true,
+          completionProvider = true,
+          documentRangeFormattingProvider = true,
+        }
+      }
+    end;
+    body = function()
+      notify('test')
+    end;
+  }
+end
+
 -- Tests will be indexed by test_name
 local test_name = arg[1]
 local timeout = arg[2]