DearPyGui Demo crashes

[helloginov]

Version: 1.11.1
Operating System: Windows 11

As a beginner in DearPyGui, I was trying demo "application" promoted by official docs (section 1.3 Demo). Carefully studying and clicking all that is possible, I found the way to crash the program. I use VS Code and Anaconda

Steps to reproduce the behavior:

1. Go to DearPyGui official tutorial
2. Copy and run the code in section 1.3 Demo:
   import dearpygui.dearpygui as dpg
import dearpygui.demo as demo

dpg.create_context()
dpg.create_viewport(title='Custom Title', width=600, height=600)

demo.show_demo()

dpg.setup_dearpygui()
dpg.show_viewport()
dpg.start_dearpygui()
dpg.destroy_context()

3. The application must be successfully opened. Click menu "Plots" --> tab "Custom" --> "Custom Series". Find the single legend at the shown plot and right click in.

4. See error:
   The Kernel crashed while executing code in the current cell or a previous cell.
   Please review the code in the cell(s) to identify a possible cause of the failure.
   Click here for more info.
   View Jupyter log for further details.

Expected behavior: everything except crashing the program

[v-ein]

Good catch!

The issue is caused by the ambiguous use of children items by different series:

• Some (probably all) series put all their children into the legend popup menu
• Custom series use slot 1 items to create a tooltip, slot 2 items to render its contents, and still use children from all slots to populate the legend popup.

There are multiple problems here:

1. Slot 1 items are used both for the popup and for the tooltip - it should probably use them for tooltip only if tooltip=True is specified.
2. Slot 2 items must not be rendered within the popup because they constitute the actual series data and not the popup menu.
3. The crash occurs because custom_series attempts to render slot 2 items in the popup with the default drawlist, which is nullptr; however, the drawing primitives absolutely require a valid drawlist pointer. With drawlist == nullptr, they dereference a null pointer. This also applies to other series, all of which attempt to render slot 2 items in the popup window too; however, the drawing primitives probably can't be added to other series due to the "acceptable parents" restriction.