Invalidate the previous caret even if the parent text node is removed.
When the last character is removed from an input, the caret node is detached,
which is the anonymous #text node. However, FrameSelection still refer to
the previous caret node to invalidate the previous caret.
Before deleting the last character "a" >
INPUT 0x3be145763a50 (focused)
#shadow-root 0x3be145763b50
DIV 0x3be145763c20 ID="inner-editor" (editable)
* #text 0x3be145763f58 "a"
After deleting the last character "a" >
INPUT 0x3be145763a50 (focused)
#shadow-root 0x3be145763b50
* DIV 0x3be145763c20 ID="inner-editor" (editable)
Currently, Blink doesn't invalidate the previous caret if the caret is detached
from DOM. This CL invalidates the caret region when the caret is detached.
TEST=webkit_unit_tests FrameSelectionTest.InvalidatePreviousCaretAfterRemovingLastCharacter
ManualTests/caret-paint-after-last-text-is-removed.html with --enable-partial-raster
BUG=528922
Review URL: https://codereview.chromium.org/1654123002
Cr-Commit-Position: refs/heads/master@{#377696}
4 files changed
