partition handlers between screen regions

This fixes one bug I know of: dragging the mouse atop the settings menu
was selecting text in the editor underneath.

0004-on.update

@@ -1,15 +1,18 @@
 on.update = function(dt)
 	refresh_debug_animations()
+	-- == menu area
 	if Active_button and Active_button.expire <= Current_time then
 		Active_button = nil
 	end
+	-- == settings area
 	if Selected_slider then
 		update_any_sliders(App.mouse_x(), App.mouse_y())
 	end
+	-- main area
 	if Current_pane.editor_state.scrollbar_drag then
 		adjust_scrollbar(Current_pane.editor_state, App.mouse_y())
 	elseif Current_pane.output_editor_state.scrollbar_drag then
 		adjust_scrollbar(Current_pane.output_editor_state, App.mouse_y())
 	end
 	if car.update then call_protected(car.update, dt) end
-end
+end

0016-on.mouse_press

@@ -1,20 +1,25 @@
 on.mouse_press = function(x,y, mouse_button)
+	-- == menu area
 	-- some hysteresis right after a button has been pressed
 	if Active_button then return end
 	if mouse_press_consumed_by_any_button_handler(Global_state, x,y, mouse_button) then
+		Button_pressed = true
 		return
 	end
 	Show_overflow = false
-	if mouse_on_any_slider(x,y, mouse_button) then
-		return
-	end
-	if not on_area(Settings_menu_area, x,y) then
-		if Show_settings then
-			-- On mobile devices, we can't depend on on.save_settings() triggering on quit
+	-- == settings area
+	if Show_settings then
+		if on_area(Settings_menu_area, x,y) then
+			mouse_on_any_slider(x,y, mouse_button)
+		else
+			Show_settings = false
+			-- On mobile devices, we can't depend on on.save_settings() triggering on quit.
+			-- So save settings every time we close the settings menu.
 			love.filesystem.write('config', json.encode(settings()))
 		end
-		Show_settings = false
+		return
 	end
+	-- == main area
 	if Show_code then
 		if on_editor_scrollbar(Current_pane.editor_state, x,y) then
 			Current_pane.editor_state.scrollbar_drag = true

0017-on.mouse_release

@@ -1,5 +1,15 @@
 on.mouse_release = function(x,y, mouse_button)
+	-- == menu area
 	Selected_slider = nil
+	if Button_pressed then
+		Button_pressed = nil
+		return
+	end
+	-- == settings area
+	if on_area(Settings_menu_area, x,y) then
+		return
+	end
+	-- == main area
 	if Show_code then
 		if Current_pane.editor_state.scrollbar_drag then
 			adjust_scrollbar(Current_pane.editor_state, y)

0150-Button_pressed

@@ -0,0 +1 @@
+Button_pressed = nil