From 892674a3f93c5189e6408501926fe0d284b43dd1 Mon Sep 17 00:00:00 2001
From: James Bardin <j.bardin@gmail.com>
Date: Tue, 12 Mar 2019 10:03:19 -0400
Subject: [PATCH] don't recalculate existing block counts in diff

If a block is uneffected by diffs, keep the block count value regardless
of what it is. Blocks containing zero values will often be represented
by only the count value.
---
 terraform/diff.go | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/terraform/diff.go b/terraform/diff.go
index 3f26117a8..a5d70e264 100644
--- a/terraform/diff.go
+++ b/terraform/diff.go
@@ -460,7 +460,6 @@ func (d *InstanceDiff) Apply(attrs map[string]string, schema *configschema.Block
 
 func (d *InstanceDiff) applyBlockDiff(path []string, attrs map[string]string, schema *configschema.Block) (map[string]string, error) {
 	result := map[string]string{}
-
 	name := ""
 	if len(path) > 0 {
 		name = path[len(path)-1]
@@ -597,7 +596,8 @@ func (d *InstanceDiff) applyBlockDiff(path []string, attrs map[string]string, sc
 			}
 		}
 
-		if countDiff, ok := d.Attributes[strings.Join(append(path, n, "#"), ".")]; ok {
+		countAddr := strings.Join(append(path, n, "#"), ".")
+		if countDiff, ok := d.Attributes[countAddr]; ok {
 			if countDiff.NewComputed {
 				result[localBlockPrefix+"#"] = hcl2shim.UnknownVariableValue
 			} else {
@@ -633,6 +633,8 @@ func (d *InstanceDiff) applyBlockDiff(path []string, attrs map[string]string, sc
 					}
 				}
 			}
+		} else if origCount, ok := attrs[countAddr]; ok && keepBlock {
+			result[localBlockPrefix+"#"] = origCount
 		} else {
 			result[localBlockPrefix+"#"] = countFlatmapContainerValues(localBlockPrefix+"#", result)
 		}