[LyX/master] Attempt to align slider and buttons in a widget

[Juergen Spitzmueller]

commit ad44f4f4483e1b7c2a358c8b6f28d7f9efdf40ff
Author: Juergen Spitzmueller <spitz at lyx.org>
Date:   Tue Mar 9 14:23:13 2021 +0100

    Attempt to align slider and buttons in a widget
---
 src/frontends/qt/GuiView.cpp |   18 +++++++++---------
 src/frontends/qt/GuiView.h   |    3 +++
 2 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/src/frontends/qt/GuiView.cpp b/src/frontends/qt/GuiView.cpp
index 679d84d..3dfad25 100644
--- a/src/frontends/qt/GuiView.cpp
+++ b/src/frontends/qt/GuiView.cpp
@@ -629,6 +629,9 @@ GuiView::GuiView(int id)
 
 	QFontMetrics const fm(statusBar()->fontMetrics());
 
+	zoomwidget_ = new QWidget(statusBar());
+	zoomwidget_->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
+	QHBoxLayout * zoomlayout = new QHBoxLayout(zoomwidget_);
 	zoom_slider_ = new QSlider(Qt::Horizontal, statusBar());
 	// Small size slider for macOS to prevent the status bar from enlarging
 	zoom_slider_->setAttribute(Qt::WA_MacSmallSize);
@@ -661,12 +664,11 @@ GuiView::GuiView(int id)
 	zoom_out_->setFixedSize(QSize(fm.height(), fm.height()));
 	zoom_out_->setFlat(true);
 
-	statusBar()->addPermanentWidget(zoom_out_);
-	zoom_out_->setEnabled(currentBufferView());
-	statusBar()->addPermanentWidget(zoom_slider_);
-	zoom_slider_->setEnabled(currentBufferView());
-	zoom_in_->setEnabled(currentBufferView());
-	statusBar()->addPermanentWidget(zoom_in_);
+	zoomlayout->addWidget(zoom_out_);
+	zoomlayout->addWidget(zoom_slider_);
+	zoomlayout->addWidget(zoom_in_);
+	zoomwidget_->setEnabled(currentBufferView());
+	statusBar()->addPermanentWidget(zoomwidget_);
 
 	connect(zoom_slider_, SIGNAL(sliderMoved(int)), this, SLOT(zoomSliderMoved(int)));
 	connect(zoom_slider_, SIGNAL(valueChanged(int)), this, SLOT(zoomValueChanged(int)));
@@ -1400,10 +1402,8 @@ void GuiView::onBufferViewChanged()
 	// Buffer-dependent dialogs must be updated. This is done here because
 	// some dialogs require buffer()->text.
 	updateDialogs();
-	zoom_slider_->setEnabled(currentBufferView());
+	zoomwidget_->setEnabled(currentBufferView());
 	zoom_value_->setEnabled(currentBufferView());
-	zoom_in_->setEnabled(currentBufferView());
-	zoom_out_->setEnabled(currentBufferView());
 }
 
 
diff --git a/src/frontends/qt/GuiView.h b/src/frontends/qt/GuiView.h
index 728ed0d..fc37bf4 100644
--- a/src/frontends/qt/GuiView.h
+++ b/src/frontends/qt/GuiView.h
@@ -29,6 +29,7 @@ class QPushButton;
 class QLabel;
 class QShowEvent;
 class QSlider;
+class QWidget;
 
 
 namespace lyx {
@@ -507,6 +508,8 @@ private:
 	QPushButton * zoom_in_;
 	/// Zoom out ("-") Button
 	QPushButton * zoom_out_;
+	/// The frame all slider elements are embedded in
+	QWidget * zoomwidget_;
 
 	/// The rate from which the actual zoom value is calculated
 	/// from the default zoom pref