[gtk/wip/exalm/scroll] Revert "Add scaling adjustment for touch dragging a scrolled window"

[Alexander Mikhaylenko <alexm src gnome org>]

commit d0cf3007c612610fb345bf71bb0c5929f6ae91a5
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Wed Mar 3 15:04:32 2021 +0500

    Revert "Add scaling adjustment for touch dragging a scrolled window"
    
    This reverts commit d4943ef2fbc5a402bb5f43f40c93700b7263f07b.
    
    This commit has broken scrolling in GtkTreeView. VTE has
    `scroll-unit-pixels` property now, so the original issue is fixed
    separately.
    
    Fixes https://gitlab.gnome.org/GNOME/gtk/-/issues/3707

 gtk/gtkscrolledwindow.c | 36 +++---------------------------------
 1 file changed, 3 insertions(+), 33 deletions(-)
---
diff --git a/gtk/gtkscrolledwindow.c b/gtk/gtkscrolledwindow.c
index 1364cd46cd..bea7339f39 100644
--- a/gtk/gtkscrolledwindow.c
+++ b/gtk/gtkscrolledwindow.c
@@ -1005,9 +1005,7 @@ scrolled_window_drag_update_cb (GtkScrolledWindow *scrolled_window,
   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
   GtkAdjustment *hadjustment;
   GtkAdjustment *vadjustment;
-  GtkScrollable *child;
-  GtkBorder border;
-  double dx, dy, scale, size;
+  gdouble dx, dy;
 
   gtk_scrolled_window_invalidate_overshoot (scrolled_window);
 
@@ -1020,25 +1018,10 @@ scrolled_window_drag_update_cb (GtkScrolledWindow *scrolled_window,
                                       GTK_EVENT_SEQUENCE_CLAIMED);
     }
 
-  child = GTK_SCROLLABLE (gtk_bin_get_child (GTK_BIN (scrolled_window)));
-
   hadjustment = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar));
   if (hadjustment && may_hscroll (scrolled_window))
     {
-      if (child && gtk_widget_get_visible (child))
-        {
-          size = gtk_widget_get_allocated_width (GTK_WIDGET (child));
-          if (gtk_scrollable_get_border (child, &border))
-            size -= border.left + border.right;
-
-          scale = gtk_adjustment_get_page_size (hadjustment) / size;
-        }
-      else
-        {
-          scale = 1.0;
-        }
-
-      dx = priv->drag_start_x - offset_x * scale;
+      dx = priv->drag_start_x - offset_x;
       _gtk_scrolled_window_set_adjustment_value (scrolled_window,
                                                  hadjustment, dx);
     }
@@ -1046,20 +1029,7 @@ scrolled_window_drag_update_cb (GtkScrolledWindow *scrolled_window,
   vadjustment = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar));
   if (vadjustment && may_vscroll (scrolled_window))
     {
-      if (child && gtk_widget_get_visible (child))
-        {
-          size = gtk_widget_get_allocated_height (GTK_WIDGET (child));
-          if (gtk_scrollable_get_border (child, &border))
-            size -= border.top + border.bottom;
-
-          scale = gtk_adjustment_get_page_size (vadjustment) / size;
-        }
-      else
-        {
-          scale = 1.0;
-        }
-
-      dy = priv->drag_start_y - offset_y * scale;
+      dy = priv->drag_start_y - offset_y;
       _gtk_scrolled_window_set_adjustment_value (scrolled_window,
                                                  vadjustment, dy);
     }