lib/text: realign struct for better size allocation

The realignment reduce the cost of the following struct,

* Chunk: from 16 to 8 bytes (-8)
* struct in TestChunk_MarshalJSON: from 40 to 32 bytes (-8)
* diff.LineChange: from 96 to 88 bytes (-8)
* Line: from 16 to 8 bytes (-8)
* struct in TestLine_MarshalJSON: from 40 to 32 bytes (-8)

1 files changed, 9 insertions, 3 deletions

diff --git a/lib/text/diff/linechange.go b/lib/text/diff/linechange.go
index 0a659f9f..b9f18470 100644
--- a/lib/text/diff/linechange.go
+++ b/lib/text/diff/linechange.go
@@ -13,15 +13,21 @@ import (
 
 // LineChange represent one change in text.
 type LineChange struct {
-	Old  text.Line
-	New  text.Line
 	Adds text.Chunks
 	Dels text.Chunks
+
+	Old text.Line
+	New text.Line
 }
 
 // NewLineChange create a pointer to new LineChange object.
 func NewLineChange(old, new text.Line) *LineChange {
-	return &LineChange{old, new, text.Chunks{}, text.Chunks{}}
+	return &LineChange{
+		Adds: text.Chunks{},
+		Dels: text.Chunks{},
+		Old:  old,
+		New:  new,
+	}
 }
 
 // String return formatted content of LineChange.