Fixup and improve gtk-touch-workaround

src/gui/Layout.cpp

@@ -168,7 +168,8 @@ void Layout::layoutPages(int width, int height) {
         recalculate_int();
     }
     // Todo: remove, just a hack-hotfix
-    scrollHandling->setLayoutSize(width, height);
+    scrollHandling->setLayoutSize(std::max(width, int(unsigned(this->pc.minWidth))),
+                                  std::max(height, int(unsigned(this->pc.minHeight))));
 
     size_t const len = this->view->viewPages.size();
     Settings* settings = this->view->getControl()->getSettings();

src/gui/MainWindow.cpp

@@ -243,23 +243,19 @@ void MainWindow::initXournalWidget() {
     usingTouchWorkaround = control->getSettings()->isTouchWorkaround();
 
     if (usingTouchWorkaround) {
-        GtkWidget* box1 = gtk_box_new(GTK_ORIENTATION_VERTICAL, 0);
-        gtk_container_add(GTK_CONTAINER(boxContents), box1);
-
-        GtkWidget* box2 = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 0);
-        gtk_container_add(GTK_CONTAINER(box1), box2);
-
+        GtkWidget* grid = gtk_grid_new();
+        gtk_container_add(GTK_CONTAINER(boxContents), grid);
         this->scrollHandling = new ScrollHandlingXournalpp();
 
-        this->xournal = new XournalView(box2, control, scrollHandling);
-
-        gtk_container_add(GTK_CONTAINER(box2),
-                          gtk_scrollbar_new(GTK_ORIENTATION_VERTICAL, scrollHandling->getVertical()));
-        gtk_container_add(GTK_CONTAINER(box1),
-                          gtk_scrollbar_new(GTK_ORIENTATION_HORIZONTAL, scrollHandling->getHorizontal()));
+        this->xournal = new XournalView(grid, control, scrollHandling);
 
-        control->getZoomControl()->initZoomHandler(this->window, box2, xournal, control);
-        gtk_widget_show_all(box1);
+        gtk_grid_attach(GTK_GRID(grid), gtk_scrollbar_new(GTK_ORIENTATION_VERTICAL, scrollHandling->getVertical()),  //
+                        1, 0, 1, 1);
+        gtk_grid_attach(GTK_GRID(grid),
+                        gtk_scrollbar_new(GTK_ORIENTATION_HORIZONTAL, scrollHandling->getHorizontal()),  //
+                        0, 1, 1, 1);
+        control->getZoomControl()->initZoomHandler(this->window, grid, xournal, control);
+        gtk_widget_show_all(grid);
     } else {
         winXournal = gtk_scrolled_window_new(nullptr, nullptr);
 

src/gui/widgets/XournalWidget.cpp

@@ -163,12 +163,14 @@ static void gtk_xournal_init(GtkXournal* xournal) {
 
 static void gtk_xournal_get_preferred_width(GtkWidget* widget, gint* minimal_width, gint* natural_width) {
     GtkXournal* xournal = GTK_XOURNAL(widget);
-    *minimal_width = *natural_width = xournal->layout->getMinimalWidth();
+    *minimal_width = 20;
+    *natural_width = xournal->layout->getMinimalWidth();
 }
 
 static void gtk_xournal_get_preferred_height(GtkWidget* widget, gint* minimal_height, gint* natural_height) {
     GtkXournal* xournal = GTK_XOURNAL(widget);
-    *minimal_height = *natural_height = xournal->layout->getMinimalHeight();
+    *minimal_height = 20;
+    *natural_height = xournal->layout->getMinimalHeight();
 }
 
 /**