[gnome-shell/wip/carlosg/ibus-osk-capability] misc: Toggle IBus OSK capability on OSK visibility

[Carlos Garnacho <carlosg src gnome org>]

commit 4ee3fe7938113b7c4dc9081d4b87c883bd7ca092
Author: Carlos Garnacho <carlosg gnome org>
Date:   Tue Aug 9 16:00:33 2022 +0200

    misc: Toggle IBus OSK capability on OSK visibility
    
    Newer versions of IBus (> 1.5.26) have the IBUS_CAP_OSK capability
    which can be used to hint the active IM about an OSK driving input as
    opposed to a physical keyboard. This may be used by IMs to tweak their
    behavior to suit OSKs better.
    
    Add the GNOME Shell side handling for this capability, and toggle it
    on whenever the OSK is visible.
    
    Since this is a far too new enum value and we don't want such new
    IBus dependency, this change plays fast and loose with JS guarantees,
    since a logical OR with an undefined value results in the other operand
    unmodified it will work for older versions where the capability does not
    exist and thus we want nothing extra enabled.

 js/misc/inputMethod.js | 8 ++++++++
 js/ui/keyboard.js      | 5 ++++-
 2 files changed, 12 insertions(+), 1 deletion(-)
---
diff --git a/js/misc/inputMethod.js b/js/misc/inputMethod.js
index 856bf57aec..fba2730bd1 100644
--- a/js/misc/inputMethod.js
+++ b/js/misc/inputMethod.js
@@ -3,6 +3,7 @@
 const { Clutter, GLib, Gio, GObject, IBus } = imports.gi;
 
 const Keyboard = imports.ui.status.keyboard;
+const Main = imports.ui.main;
 
 Gio._promisify(IBus.Bus.prototype,
     'create_input_context_async', 'create_input_context_async_finish');
@@ -42,6 +43,9 @@ class InputMethod extends Clutter.InputMethod {
     _updateCapabilities() {
         let caps = IBus.Capabilite.PREEDIT_TEXT | IBus.Capabilite.FOCUS | IBus.Capabilite.SURROUNDING_TEXT;
 
+        if (Main.keyboard.visible)
+            caps |= IBus.Capabilite.OSK;
+
         if (this._context)
             this._context.set_capabilities(caps);
     }
@@ -72,10 +76,14 @@ class InputMethod extends Clutter.InputMethod {
         this._context.connect('forward-key-event', this._onForwardKeyEvent.bind(this));
         this._context.connect('destroy', this._clear.bind(this));
 
+        Main.keyboard.connectObject('visibility-changed', () => this._updateCapabilities());
+
         this._updateCapabilities();
     }
 
     _clear() {
+        Main.keyboard.disconnectObject(this);
+
         if (this._cancellable) {
             this._cancellable.cancel();
             this._cancellable = null;
diff --git a/js/ui/keyboard.js b/js/ui/keyboard.js
index ac36f3573a..77a6f7d5cc 100644
--- a/js/ui/keyboard.js
+++ b/js/ui/keyboard.js
@@ -1180,8 +1180,10 @@ var Keypad = GObject.registerClass({
     }
 });
 
-var KeyboardManager = class KeyBoardManager {
+var KeyboardManager = class extends Signals.EventEmitter {
     constructor() {
+        super();
+
         this._keyboard = null;
         this._a11yApplicationsSettings = new Gio.Settings({ schema_id: A11Y_APPLICATIONS_SCHEMA });
         this._a11yApplicationsSettings.connect('changed', this._syncEnabled.bind(this));
@@ -1237,6 +1239,7 @@ var KeyboardManager = class KeyBoardManager {
         if (enabled && !this._keyboard) {
             this._keyboard = new Keyboard();
             this._keyboard.connect('visibility-changed', () => {
+                this.emit('visibility-changed');
                 this._bottomDragAction.enabled = !this._keyboard.visible;
             });
         } else if (!enabled && this._keyboard) {