remove deprecated VirtualSize formatting options and output

The `VirtualSize` field was deprecated in [moby@1261fe6], and omitted / removed
in API v1.44 in [moby@913b0f5], and the corresponding formatting placeholder
was deprecated in [cli@f02301a].

This patch removes the formatting function, which also removes it from the
`docker image ls --format=json` output.

[moby@1261fe6]: moby/moby@1261fe6
[moby@913b0f5]: moby/moby@913b0f5
[cli@f02301a]: f02301a

Signed-off-by: Sebastiaan van Stijn <[email protected]>

Author: thaJeztah

cli/command/formatter/image.go

@@ -202,7 +202,6 @@ func newImageContext() *imageContext {
 		"CreatedAt":    CreatedAtHeader,
 		"Size":         SizeHeader,
 		"Containers":   containersHeader,
-		"VirtualSize":  SizeHeader, // Deprecated: VirtualSize is deprecated, and equivalent to Size.
 		"SharedSize":   sharedSizeHeader,
 		"UniqueSize":   uniqueSizeHeader,
 	}
@@ -257,15 +256,6 @@ func (c *imageContext) Containers() string {
 	return strconv.FormatInt(c.i.Containers, 10)
 }
 
-// VirtualSize shows the virtual size of the image and all of its parent
-// images. Starting with docker 1.10, images are self-contained, and
-// the VirtualSize is identical to Size.
-//
-// Deprecated: VirtualSize is deprecated, and equivalent to [imageContext.Size].
-func (c *imageContext) VirtualSize() string {
-	return units.HumanSize(float64(c.i.Size))
-}
-
 func (c *imageContext) SharedSize() string {
 	if c.i.SharedSize == -1 {
 		return "N/A"

cli/command/formatter/image_test.go

@@ -68,11 +68,6 @@ func TestImageContext(t *testing.T) {
 			expValue: "10",
 			call:     ctx.Containers,
 		},
-		{
-			imageCtx: imageContext{i: image.Summary{Size: 10000}},
-			expValue: "10kB",
-			call:     ctx.VirtualSize, //nolint:nolintlint,staticcheck // ignore SA1019: field is deprecated, but still set on API < v1.44.
-		},
 		{
 			imageCtx: imageContext{i: image.Summary{SharedSize: 10000}},
 			expValue: "10kB",