fix(git): set filetype on URI buffers from the inner path

lua/git/object.lua

@@ -198,14 +198,13 @@ function M.read_uri(buf)
     end
 
     local parsed = util.parse_revspec(revspec)
-    local index_path = parsed.stage == 0 and parsed.path or nil
-    if index_path then
+    if parsed.stage == 0 and parsed.path then
         vim.bo[buf].buftype = "acwrite"
         -- Re-running BufReadCmd (e.g. on `:edit`) would otherwise stack
         -- another BufWriteCmd on the same buffer, so each `:w` runs
         -- hash-object + update-index N times.
         if not vim.b[buf].git_index_writer then
-            attach_index_writer(buf, worktree, index_path)
+            attach_index_writer(buf, worktree, parsed.path)
             vim.b[buf].git_index_writer = true
         end
     else
@@ -214,8 +213,23 @@ function M.read_uri(buf)
     end
     vim.bo[buf].modified = false
 
-    -- BufReadCmd suppresses the normal BufReadPost dispatch, so filetype
-    -- detection and modeline parsing don't run unless we fire it ourselves.
+    -- Filetype from the inner path. We can't lean on `vim.filetype.add`
+    -- because Vim normalises `git://` filenames (cwd-prefix + collapses
+    -- `://` to `:/`) before matching, breaking any pattern keyed on the
+    -- raw scheme as well as any built-in pattern that doesn't catch a
+    -- recognisable extension on the mangled form (.Xresources is the
+    -- canonical example).
+    if parsed.path then
+        local ft = vim.filetype.match({ filename = parsed.path, buf = buf })
+        if ft then
+            vim.bo[buf].filetype = ft
+        end
+    end
+
+    -- BufReadCmd suppresses the normal BufReadPost dispatch, so
+    -- modeline parsing doesn't run unless we fire it ourselves. The
+    -- modeline can still override the filetype set above; standard Vim
+    -- precedence.
     vim.api.nvim_exec_autocmds("BufReadPost", { buffer = buf })
 end