## Description
This reverts commit 879917b to re-land #40542 to fix the lint warning which caused the original PR to be reverted (the lint warnings were turned on after the original was landed, which is why it wasn't caught earlier).
This PR simplifies the FlView GL interactions. It removes some code paths that were never being used (possibly for future use with platform views?) and complex internal APIs that could be done in a single method call. This is motivated in investigating https://github.com/ubuntu-flutter-community/software/issues/868.
I plan to take this further, since there doesn't seem to be any reason why multiple FlGLArea widgets are used - we can draw all the layers in one widget.
For reviewers - the individual commits aren't particularly interesting, I just did it that way to be sure I wasn't breaking anything along the way and help to diagnose any regressions in the future.
The structural changes that this PR is simplifying came in 0561c75b4d6036e7d2c7e06163a3f0629464db9f.
Support for using dart:mirrors has been deprecated for nearly two years.
this removes support for enabling mirrors from the embedder as
documented in the deprecation comment. This was primarily added as a
workaround for an internal tooling usecase, which no longer exists.
Issue: https://github.com/flutter/flutter/issues/120924
GObject's dispose() method may be called multiple times. Guard against
trying to disconnect the same signal multiple times by clearing the ID
to avoid warnings when closing the window.
```
(bug:74019): GLib-GObject-WARNING **: 11:15:08.697: ../../../gobject/gsignal.c:2731: instance '0x55e1c3ea0200' has no handler with id '255'
```
This PR takes a step back and changes the GTK IM client window back from FlView to GtkApplicationWindow as it was before #33111. The window was originally changed to FlView to make the code testable by cutting a dependency to gtk_widget_translate_coordinates(). The change was hard to revert because there were several conflicting changes on top. Therefore, this PR introduces an FlTextInputViewDelegate to be able to provide coordinate mapping in a testable way.
Fixes: flutter/flutter#108832
When Orca has "Speak object under mouse" enabled, it tries to get the
text range extents for any object that implements the AtkText interface
and gets a bit confused by our AtkText stub implementation that merely
returns null for `get_text`.
Removing the stub implementation helps to avoid the issue that Orca
would try to call `atk_text_get_range_extents()` with `start_offset=0`
and `end_offset=0`:
> Atk-CRITICAL **: atk_text_get_range_extents: assertion 'start_offset >= 0 && start_offset < end_offset' failed
`gdk_keymap_get_for_display()` does not transfer ownership to the
caller. Destroying the keymap object would cause problems further down
the road when `GtkWindow` gets to clean up and tries to destroy the
same keymap.
* Make FlAccessibleNode derivable
This allows introducing specialized subclasses that implement such a11y
interfaces as AtkEditableText that should not be implemented for the
generic node.
* FlAccessibleNode: add set value, text selection & perform action
Prepare API required for the upcoming AtkEditableText implementation.
* FlViewAccessible: postpone child node creation
This changes the a11y node creation flow so that (unknown) child nodes
are not pre-created when their parent is updated but "pending" child
node IDs are collected for later. Parent-child relationships are
established at the end of update batches when all nodes have been
created.
* Add FlAccessibleTextField that implements AtkEditableText
Solves: flutter/flutter#103191
* FlEngine: add fl_engine_update_accessibility_features()
* FlSettings: add API for high-contrast & animations
* FlEngine: allow passing mock messenger at construction time
* FlSettingsPlugin: report accessibility features
Merges most (but not all) of the impeller .clang-tidy rules into the
main .clang-tidy config. Merges:
readability-identifier-naming.PrivateMemberSuffix (_)
readability-identifier-naming.EnumConstantPrefix (k)
modernize-use-default-member-init.UseAssignment
Does not merge:
readability-identifier-naming.PublicMethodCase (CamelCase)
readability-identifier-naming.PrivateMethodCase (CamelCase)
These last two are not merged due to the non-trivial number of existing
field accessors that use field_name() methods to directly return
field_name_. While these are permitted by the C++ style guide, we may
want to move to a single, simple rule and name everything in CamelCase.
These can be enabled in a followup patch.
No new tests added, since this change is style-only.
Let MockBinaryMessenger internally manage the FlBinaryMessenger wrapper
instance and provide it via operator FlBinaryMessenger*() to avoid
having to create two objects in every test. The same technique was used
for MockSettings in #32618.
This PR is a continuation of #33111 and includes necessary changes to test the `TextInputType.setClient()` platform channel call. Testing the actual text input flow requires a mock IM context that will follow in a separate PR.
* [Linux] pass GdkWindow instead of FlView to FlTextInputPlugin
* [Linux] add MockBinaryMessenger::ReceiveMessage()
* [Linux] add test for TextInputType.setClient
* Drop the offscreen window
GdkOffscreenWindow requires display & screen which is a problem in
headless mode. Luckily, we don't really need a window instance in tests
because its only passed as a client window to the IM context which will
be mocked out when we get to tests that depend on it.
GTK IM operates in [coordinates relative to its client window](https://docs.gtk.org/gtk3/method.IMContext.set_cursor_location.html#:~:text=The%20location%20is%20relative%20to%20the%20client%C2%A0window.). Let GTK
IM use the native window that backs FlView, which is the same native
window that is used for key event processing - see GDK_KEY_XXX_MASK in
fl_view_realize().
This is an important step towards testable FlTextInputPlugin because it
eliminates the depency to GtkWidget's coordinate translation API and
that way paves the road for replacing FlTextInputPlugin's FlView
instance with a plain GdkWindow. In tests, that window can be an
instance of GdkOffscreenWindow.
There are no tests included yet but after a few more refactoring steps
it will be possible to execute tests like this: [fl_text_input_plugin_test.cc](f2e0d91b59/shell/platform/linux/fl_text_input_plugin_test.cc).
The other refactoring steps are visible at [jpnurmi/engine/commits/text-input-plugin](https://github.com/jpnurmi/engine/commits/text-input-plugin).
