Add option to disable autoscroll of editor (#4721).

git-svn-id: svn://localhost/ardour2/branches/3.0@12744 d708f5d6-7413-0410-9779-e7cbd77b26cf

gtk2_ardour/editor_canvas.cc

@@ -501,6 +501,10 @@ Editor::autoscroll_fudge_threshold () const
 void
 Editor::maybe_autoscroll (bool allow_horiz, bool allow_vert, bool moving_left, bool moving_up)
 {
+	if (!Config->get_autoscroll_editor ()) {
+		return;
+	}
+	
 	bool startit = false;
 
 	/* Work out the distance between the right hand edge of the trackview and the edge of

gtk2_ardour/rc_option_editor.cc

@@ -1150,6 +1150,14 @@ RCOptionEditor::RCOptionEditor ()
 		     sigc::mem_fun (*_rc_config, &RCConfiguration::set_name_new_markers)
 		     ));
 
+	add_option (_("Editor"),
+	    new BoolOption (
+		    "autoscroll-editor",
+		    _("Auto-scroll editor window when dragging near its edges"),
+		    sigc::mem_fun (*_rc_config, &RCConfiguration::get_autoscroll_editor),
+		    sigc::mem_fun (*_rc_config, &RCConfiguration::set_autoscroll_editor)
+		    ));
+
 	/* AUDIO */
 
 	add_option (_("Audio"), new OptionEditorHeading (_("Buffering")));

libs/ardour/ardour/rc_configuration_vars.h

@@ -76,6 +76,7 @@ CONFIG_VARIABLE (std::string, keyboard_layout_name, "keyboard-layout-name", "ans
 CONFIG_VARIABLE (bool, automation_follows_regions, "automation-follows-regions", true)
 CONFIG_VARIABLE (bool, region_boundaries_from_selected_tracks, "region-boundaries-from-selected-tracks", true)
 CONFIG_VARIABLE (bool, region_boundaries_from_onscreen_tracks, "region-boundaries-from-onscreen_tracks", true)
+CONFIG_VARIABLE (bool, autoscroll_editor, "autoscroll-editor", true)
 
 /* monitoring, mute, solo etc */