Invalidate caret during paint invalidation

third_party/WebKit/LayoutTests/platform/linux/paint/invalidation/4776765-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutBlockFlow DIV",
           "rect": [7, 43, 786, 62],
           "reason": "outline"
         },
         {
           "object": "LayoutBlockFlow DIV id='div'",
           "rect": [8, 84, 784, 20],
           "reason": "layoutObject insertion"
         },
         {
           "object": "LayoutBlockFlow DIV id='div'",
-          "rect": [7, 83, 3, 21],
-          "reason": "invalidate paint rectangle"
-        },
-        {
-          "object": "LayoutBlockFlow DIV id='div'",
-          "rect": [7, 83, 3, 21],
-          "reason": "invalidate paint rectangle"
-        },
-        {
-          "object": "LayoutBlockFlow DIV id='div'",
-          "rect": [7, 83, 3, 21],
-          "reason": "invalidate paint rectangle"
-        },

[Xianzhu, 2017/01/31 18:39:52]

These disappeared because the caret changed while the containing block needed
full paint invalidation.

The rects exceed the visual rect of the containing block by 1 pixel edges
because the inflate(1) for caret visual rects. The inflation seems unnecessary.
I would like to address this in a follow-up.

-        {
-          "object": "LayoutBlockFlow DIV id='div'",
           "rect": [7, 63, 3, 21],
-          "reason": "invalidate paint rectangle"
+          "reason": "caret"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
-      "object": "Caret",
-      "reason": "invalidate paint rectangle"
-    },
-    {
-      "object": "Caret",
-      "reason": "invalidate paint rectangle"
-    },
-    {
       "object": "LayoutBlockFlow DIV",
       "reason": "outline"
     },
     {
+      "object": "Caret",
+      "reason": "caret"
+    },
+    {
+      "object": "Caret",
+      "reason": "caret"
+    },
+    {
       "object": "LayoutBlockFlow DIV id='div'",
       "reason": "layoutObject insertion"
     },
     {
       "object": "RootInlineBox",
       "reason": "layoutObject insertion"
     },
     {
       "object": "Caret",
-      "reason": "invalidate paint rectangle"
+      "reason": "caret"
     },
     {
       "object": "Caret",
-      "reason": "invalidate paint rectangle"
+      "reason": "caret"
     },
     {
       "object": "LayoutBR BR",
       "reason": "layoutObject insertion"
     },
     {
       "object": "InlineTextBox '\n'",
       "reason": "layoutObject insertion"
     }
   ]
 }