[LyX/master] Adapt to macOS's double-space auto correction (#12975, #13292)

commit 9fa59bdfe5f6d63f7b1ea0f594475424eb326fc0
Author: Koji Yokota <[email protected]>
Date:   Thu Apr 23 22:29:45 2026 +0900

    Adapt to macOS's double-space auto correction (#12975, #13292)
---
 src/frontends/qt/GuiWorkArea.cpp       | 29 +++++++++++++++++++++++++++++
 src/frontends/qt/GuiWorkArea_Private.h |  6 ++++++
 2 files changed, 35 insertions(+)

diff --git a/src/frontends/qt/GuiWorkArea.cpp b/src/frontends/qt/GuiWorkArea.cpp
index 2671b60f07..08a223bb03 100644
--- a/src/frontends/qt/GuiWorkArea.cpp
+++ b/src/frontends/qt/GuiWorkArea.cpp
@@ -674,9 +674,38 @@ bool GuiWorkArea::event(QEvent * e)
 			keyPressEvent(ke);
 			return true;
 		}
+#ifdef Q_OS_MACOS
+		// see "case QEvent::InputMethod:" below
+		if (ke->key() == Qt::Key_Space)
+			d->prev_space_key_ = true;
+		else
+			d->prev_space_key_ = false;
+#endif
 		return QAbstractScrollArea::event(e);
 	}
 
+	case QEvent::InputMethod: {
+		QInputMethodEvent * ev = static_cast<QInputMethodEvent*>(e);
+#ifdef Q_OS_MACOS
+		// Hitting double spaces turns the second space into an input method
+		// commit string "a period plus a space" in the default English keyboard
+		// if this feature is turned on in the system settings.
+		// Responding to the following Qt::InputMethodQueries triggers the
+		// the keyboard to send the commit string mentioned above:
+		//    * Qt::ImCursorPosition,
+		//    * Qt::ImAbsolutePosition, and
+		//    * Qt::ImTextBeforeCursor.
+
+		if (d->prev_space_key_ && ev->commitString() == d->auto_replacement_str_) {
+			// delete the already typed space out of the input method
+			lyx::dispatch(FuncRequest(LFUN_CHAR_DELETE_BACKWARD));
+			d->prev_space_key_ = false;
+		}
+#endif
+		inputMethodEvent(ev);
+		return e->isAccepted();
+	}
+
 	default:
 		return QAbstractScrollArea::event(e);
 	}
diff --git a/src/frontends/qt/GuiWorkArea_Private.h b/src/frontends/qt/GuiWorkArea_Private.h
index 5dff7ce5f7..105603757a 100644
--- a/src/frontends/qt/GuiWorkArea_Private.h
+++ b/src/frontends/qt/GuiWorkArea_Private.h
@@ -156,6 +156,12 @@ struct GuiWorkArea::Private
 	QTransform item_trans_;
 	/// whether item_rect_ and item_trans need to be reset
 	bool item_geom_needs_reset_ = false;
+#ifdef Q_OS_MACOS
+	/// whether previously input key was a spacekey
+	bool prev_space_key_ = false;
+	/// the replacement string that macOS sends when double spaces are hit
+	QString const auto_replacement_str_ = ". ";
+#endif
 	/// for debug
 	//QLocale::Language im_lang_ = QLocale::AnyLanguage;
 
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