From c45b62084ce9e54432f8d52c082856e07b5ad28c Mon Sep 17 00:00:00 2001
From: John Preston <johnprestonmail@gmail.com>
Date: Wed, 12 Aug 2020 21:00:03 +0400
Subject: [PATCH] Support hidden custom title on macOS.

---
 ui/platform/mac/ui_window_mac.mm       | 9 +++++++++
 ui/platform/mac/ui_window_title_mac.h  | 1 +
 ui/platform/mac/ui_window_title_mac.mm | 4 ++++
 3 files changed, 14 insertions(+)

diff --git a/ui/platform/mac/ui_window_mac.mm b/ui/platform/mac/ui_window_mac.mm
index f2a1837..8af0e0b 100644
--- a/ui/platform/mac/ui_window_mac.mm
+++ b/ui/platform/mac/ui_window_mac.mm
@@ -197,6 +197,9 @@ WindowHelper::WindowHelper(not_null<RpWidget*> window)
 		_private->customTitleHeight())
 	: nullptr)
 , _body(Ui::CreateChild<RpWidget>(window.get())) {
+	if (_title->shouldBeHidden()) {
+		toggleCustomTitle(false);
+	}
 	init();
 }
 
@@ -218,10 +221,16 @@ void WindowHelper::setTitle(const QString &title) {
 void WindowHelper::setTitleStyle(const style::WindowTitle &st) {
 	if (_title) {
 		_title->setStyle(st);
+		if (_title->shouldBeHidden()) {
+			toggleCustomTitle(false);
+		}
 	}
 }
 
 void WindowHelper::toggleCustomTitle(bool visible) {
+	if (_title->shouldBeHidden()) {
+		visible = false;
+	}
 	if (!_title || _title->isHidden() != visible) {
 		return;
 	}
diff --git a/ui/platform/mac/ui_window_title_mac.h b/ui/platform/mac/ui_window_title_mac.h
index af31a29..3aac917 100644
--- a/ui/platform/mac/ui_window_title_mac.h
+++ b/ui/platform/mac/ui_window_title_mac.h
@@ -29,6 +29,7 @@ public:
 	void setText(const QString &text);
 	void setStyle(const style::WindowTitle &st);
 	[[nodiscard]] QString text() const;
+	[[nodiscard]] bool shouldBeHidden() const;
 
 protected:
 	void paintEvent(QPaintEvent *e) override;
diff --git a/ui/platform/mac/ui_window_title_mac.mm b/ui/platform/mac/ui_window_title_mac.mm
index abd431b..d768122 100644
--- a/ui/platform/mac/ui_window_title_mac.mm
+++ b/ui/platform/mac/ui_window_title_mac.mm
@@ -38,6 +38,10 @@ void TitleWidget::setStyle(const style::WindowTitle &st) {
 	update();
 }
 
+bool TitleWidget::shouldBeHidden() const {
+	return !_st->height;
+}
+
 QString TitleWidget::text() const {
 	return _text;
 }