x/tools/gopls/internal/analysis/modernize: mapsloop loses commentary

[adonovan]

The mapsloop transformation discards comments:

diff --git a/src/go/doc/reader.go b/src/go/doc/reader.go
index e84d6d9a71..6e8c682087 100644
--- a/src/go/doc/reader.go
+++ b/src/go/doc/reader.go
-                       for name, f := range t.funcs {
-                               // in a correct AST, package-level function names
-                               // are all different - no need to check for conflicts
-                               r.funcs[name] = f
-                       }
+                       maps.Copy(r.funcs, t.funcs)

Until recently, minmax used to do the same (#72727). We should apply a similar fix, here and anywhere else that discards a block.

[gopherbot]

Change https://go.dev/cl/660255 mentions this issue: gopls/internal/analysis/modernize: preserves comments in mapsloop