https://bugs.webkit.org/show_bug.cgi?id=228269
rdar://80556392
Reviewed by Tim Horton.
Source/WebKit:
In Safari on iOS 15, if the selection (either ranged or caret) is inside a fixed position container when the
user taps on the unified field, we'll immediately clear the text selection inside the unified field upon
bringing up the keyboard. This happens because the tab pill in iOS 15 is lowered as the URL bar is focused,
which causes the web view to scroll slightly. This, in turn, induces a brief unstable scrolling tree state,
which then causes us to temporarily hide and show selection views while scrolling in unstable state (see
r209931) by calling `-deactivateSelection` and then `-activateSelection` on the text interaction assistant.
Calling `-[UIWKTextInteractionAssistant activateSelection]` then causes UIKit to dispatch a
UITextSelectionViewActivatedNotification; In the unified field, which is a UITextField subclass, UIKit code then
listens for this notification and responds to it by clearing the selection if the newly activated selection's
host view (WKContentView) is different than itself, thereby causing the bug.
To fix this, we simply make two (minor) adjustments to the logic for temporarily hiding and showing the
selection while performing an unstable scroll. See below for more details.
Test: editing/selection/ios/scrolling-with-fixed-selection-does-not-unselect-native-text-field.html
* UIProcess/ios/WKContentViewInteraction.mm:
(-[WKContentView shouldHideSelectionWhenScrolling]):
Only hide and (later) restore the selection in non-editable text if the selection is ranged. This is because
caret selections in non-editable content are not user-visible anyways, so there's no need to temporarily
suppress the selection.
(-[WKContentView _updateChangedSelection:]):
Only attempt to show the selection views again if doing so doesn't cause us to steal first responder status away
from the existing first responder; otherwise, we'll wait until we `-becomeFirstResponder` to `-activateSelection`.
(-[WKContentView selectionInteractionAssistant]): Deleted.
Tools:
We already have some very basic support for installing and removing native text fields in the view hierarchy,
through `TestRunner::(add|remove)ChromeInputField()`. In order to support the new layout test, we additionally
implement the ability to:
- Set text inside the native chrome input field that was installed using `addChromeInputField()`.
- Select all text inside the chrome input field.
- Query the chrome input field for the currently selected text.
We only support iOS for the time being, with stubs on other platforms, since the new test that uses this
functionality is iOS-specific; if needed in the future for a similar test on other platforms, we can implement
the stubbed testing hooks on TestRunner and PlatformWebView as well.
* DumpRenderTree/TestRunner.h:
* DumpRenderTree/mac/TestRunnerMac.mm:
(TestRunner::setTextInChromeInputField):
(TestRunner::selectChromeInputField):
(TestRunner::getSelectedTextInChromeInputField):
* DumpRenderTree/win/TestRunnerWin.cpp:
(TestRunner::setTextInChromeInputField):
(TestRunner::selectChromeInputField):
(TestRunner::getSelectedTextInChromeInputField):
* WebKitTestRunner/InjectedBundle/Bindings/TestRunner.idl:
* WebKitTestRunner/InjectedBundle/InjectedBundle.cpp:
(WTR::InjectedBundle::didReceiveMessageToPage):
(WTR::InjectedBundle::postSetTextInChromeInputField):
(WTR::InjectedBundle::postSelectChromeInputField):
(WTR::InjectedBundle::postGetSelectedTextInChromeInputField):
* WebKitTestRunner/InjectedBundle/InjectedBundle.h:
* WebKitTestRunner/InjectedBundle/TestRunner.cpp:
(WTR::TestRunner::setTextInChromeInputField):
(WTR::TestRunner::selectChromeInputField):
(WTR::TestRunner::getSelectedTextInChromeInputField):
(WTR::TestRunner::callSetTextInChromeInputFieldCallback):
(WTR::TestRunner::callSelectChromeInputFieldCallback):
(WTR::TestRunner::callGetSelectedTextInChromeInputFieldCallback):
* WebKitTestRunner/InjectedBundle/TestRunner.h:
* WebKitTestRunner/PlatformWebView.h:
* WebKitTestRunner/TestInvocation.cpp:
(WTR::TestInvocation::didReceiveMessageFromInjectedBundle):
* WebKitTestRunner/gtk/PlatformWebViewGtk.cpp:
(WTR::PlatformWebView::setTextInChromeInputField):
(WTR::PlatformWebView::selectChromeInputField):
(WTR::PlatformWebView::getSelectedTextInChromeInputField):
* WebKitTestRunner/ios/PlatformWebViewIOS.mm:
(WTR::chromeInputField):
Additionally do some light refactoring by pulling out logic for grabbing the chrome input field (i.e. a view
with a tag of 1 under the window) out into a separate helper method. Use this helper in a few places below.
(WTR::PlatformWebView::addChromeInputField):
(WTR::PlatformWebView::setTextInChromeInputField):
(WTR::PlatformWebView::selectChromeInputField):
(WTR::PlatformWebView::getSelectedTextInChromeInputField):
(WTR::PlatformWebView::removeChromeInputField):
* WebKitTestRunner/mac/PlatformWebViewMac.mm:
(WTR::PlatformWebView::setTextInChromeInputField):
(WTR::PlatformWebView::selectChromeInputField):
(WTR::PlatformWebView::getSelectedTextInChromeInputField):
* WebKitTestRunner/win/PlatformWebViewWin.cpp:
(WTR::PlatformWebView::setTextInChromeInputField):
(WTR::PlatformWebView::selectChromeInputField):
(WTR::PlatformWebView::getSelectedTextInChromeInputField):
* WebKitTestRunner/wpe/PlatformWebViewWPE.cpp:
(WTR::PlatformWebView::setTextInChromeInputField):
(WTR::PlatformWebView::selectChromeInputField):
(WTR::PlatformWebView::getSelectedTextInChromeInputField):
LayoutTests:
Add a new layout test that installs, focuses, and selects text inside a native UITextField (simulating Safari's
URL field) while the DOM selection is inside a fixed position container, and then scrolls the web view a bit to
temporarily induce an unstable scrolling tree state. After this, we verify that the text selection inside the
native text field has not been cleared.
See Tools/ changes for more details.
* editing/selection/ios/scrolling-with-fixed-selection-does-not-unselect-native-text-field-expected.txt: Added.
* editing/selection/ios/scrolling-with-fixed-selection-does-not-unselect-native-text-field.html: Added.
* resources/ui-helper.js:
(window.UIHelper.addChromeInputField):
(window.UIHelper.removeChromeInputField):
(window.UIHelper.setTextInChromeInputField):
(window.UIHelper.selectChromeInputField):
(window.UIHelper.getSelectedTextInChromeInputField):
(window.UIHelper):
Canonical link: https://commits.webkit.org/239946@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@280288 268f45cc-cd09-0410-ab3c-d52691b4dbfc
1a180891ec