Set Move Line(s) default keybindings, change Move Tab defaults

This does not affect existing users.

Ctrl-Shift-PageUp   Move document left
Ctrl-Shift-PageDown Move document right

The above shortcuts were aliases for selecting left/rightmost
documents, but those are not necessary as Alt-1/Alt-0 does the same.

Alt-PageUp      Move line(s) up
Alt-PageDown    Move line(s) down

Alt is easier to press than Ctrl-Shift, so is better for moving lines
as this needs more accuracy.

doc/geany.txt

@@ -3158,7 +3158,7 @@ by any custom keybindings with the same keyboard shortcut.
 Switching documents
 ^^^^^^^^^^^^^^^^^^^
 
-There are a few non-configurable bindings to switch between documents,
+There are some non-configurable bindings to switch between documents,
 listed below. These can also be overridden by custom keybindings.
 
 =============== ==================================
@@ -3166,10 +3166,10 @@ Key             Action
 =============== ==================================
 Alt-[1-9]       Select left-most tab, from 1 to 9.
 Alt-0           Select right-most tab.
-Ctrl-Shift-PgUp Select left-most tab.
-Ctrl-Shift-PgDn Select right-most tab.
 =============== ==================================
 
+See also `Notebook tab keybindings`_.
+
 
 Configurable keybindings
 ^^^^^^^^^^^^^^^^^^^^^^^^
@@ -3288,10 +3288,10 @@ Word part completion            Tab                       When the autocompletio
                                                           the currently selected item up to the next word
                                                           part.
 
-Move line(s) up                                           Move the current line or selected lines up by
+Move line(s) up                 Alt-PageUp                Move the current line or selected lines up by
                                                           one line.
 
-Move line(s) down                                         Move the current line or selected lines down by
+Move line(s) down               Alt-PageDown              Move the current line or selected lines down by
                                                           one line.
 =============================== ========================= ==================================================
 
@@ -3591,10 +3591,10 @@ Switch to last used document    Ctrl-Tab                  Switches to the previo
                                                           used document, 3rd-last, etc. Also known as
                                                           Most-Recently-Used documents switching.
 
-Move document left              Alt-PageUp                Changes the current document with the left hand
+Move document left              Ctrl-Shift-PageUp         Changes the current document with the left hand
                                                           one.
 
-Move document right             Alt-PageDown              Changes the current document with the right hand
+Move document right             Ctrl-Shift-PageDown       Changes the current document with the right hand
                                                           one.
 
 Move document first                                       Moves the current document to the first position.

src/keybindings.c

@@ -315,9 +315,9 @@ static void init_default_kb(void)
 	keybindings_set_item(group, GEANY_KEYS_EDITOR_WORDPARTCOMPLETION, NULL,
 		GDK_Tab, 0, "edit_wordpartcompletion", _("Word part completion"), NULL);
 	keybindings_set_item(group, GEANY_KEYS_EDITOR_MOVELINEUP, NULL,
-		0, 0, "edit_movelineup", _("Move line(s) up"), NULL);
+		GDK_Page_Up, GDK_MOD1_MASK, "edit_movelineup", _("Move line(s) up"), NULL);
 	keybindings_set_item(group, GEANY_KEYS_EDITOR_MOVELINEDOWN, NULL,
-		0, 0, "edit_movelinedown", _("Move line(s) down"), NULL);
+		GDK_Page_Down, GDK_MOD1_MASK, "edit_movelinedown", _("Move line(s) down"), NULL);
 
 	group = keybindings_get_core_group(GEANY_KEY_GROUP_CLIPBOARD);
 
@@ -526,9 +526,11 @@ static void init_default_kb(void)
 	keybindings_set_item(group, GEANY_KEYS_NOTEBOOK_SWITCHTABLASTUSED, cb_func_switch_tablastused,
 		GDK_Tab, GDK_CONTROL_MASK, "switch_tablastused", _("Switch to last used document"), NULL);
 	keybindings_set_item(group, GEANY_KEYS_NOTEBOOK_MOVETABLEFT, cb_func_move_tab,
-		GDK_Page_Up, GDK_MOD1_MASK, "move_tableft", _("Move document left"), NULL);
+		GDK_Page_Up, GDK_CONTROL_MASK | GDK_SHIFT_MASK, "move_tableft",
+		_("Move document left"), NULL);
 	keybindings_set_item(group, GEANY_KEYS_NOTEBOOK_MOVETABRIGHT, cb_func_move_tab,
-		GDK_Page_Down, GDK_MOD1_MASK, "move_tabright", _("Move document right"), NULL);
+		GDK_Page_Down, GDK_CONTROL_MASK | GDK_SHIFT_MASK, "move_tabright",
+		_("Move document right"), NULL);
 	keybindings_set_item(group, GEANY_KEYS_NOTEBOOK_MOVETABFIRST, cb_func_move_tab,
 		0, 0, "move_tabfirst", _("Move document first"), NULL);
 	keybindings_set_item(group, GEANY_KEYS_NOTEBOOK_MOVETABLAST, cb_func_move_tab,
@@ -969,6 +971,7 @@ static gboolean check_fixed_kb(guint keyval, guint state)
 		gtk_notebook_set_current_page(GTK_NOTEBOOK(main_widgets.notebook), page);
 		return TRUE;
 	}
+	/* note: these are now overridden by default with move tab bindings */
 	if (keyval == GDK_Page_Up || keyval == GDK_Page_Down)
 	{
 		/* switch to first or last document */