internal/lsp: return the actual range from convenience code actions

Convenience code actions operates at line-by-line, but a line can
contain more than one fix.

To be able to tell them apart each response now return the actual
range as reported by the analyzer.

Fixes golang/go#40328

Change-Id: I9ffe4737653d2a5a6dafc3574e74975a71c71937
Reviewed-on: https://go-review.googlesource.com/c/tools/+/243877
Run-TryBot: Pontus Leitzler <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>
Reviewed-by: Rebecca Stambler <[email protected]>

Author: leitzler

internal/lsp/code_action.go

@@ -332,7 +332,7 @@ func convenienceFixes(ctx context.Context, snapshot source.Snapshot, ph source.P
 		case fillstruct.Analyzer.Name:
 			arg, err := json.Marshal(CommandRangeArgument{
 				URI:   protocol.URIFromSpanURI(d.URI),
-				Range: rng,
+				Range: d.Range,
 			})
 			if err != nil {
 				return nil, err