Drag callback is too slowly when you hold down keyboard.

## Version of Dear PyGui

* Version: 1.6.2
* Operating System: Windows10
* Python: 3.8.5

## My Issue/Question

Drag callback is too slowly when you hold down keyboard.

## To Reproduce

Steps to reproduce the behavior:
1. Execute example code.
2. Drag mouse on primary window. (Quick)
3. Hold down space key.
4. Drag mouse on primary window. (Slow)

## Expected behavior

Even if you hold down any key, draw lines as quickly as if you did not hold down any key.

## Standalone, minimal, complete and verifiable example

```python
import dearpygui.dearpygui as dpg

HEIGHT = 480
WIDTH = 640

prev_pos = None

def release_func(sender, app_data):
global prev_pos
prev_pos = None

def drag_func(sender, app_data):
global prev_pos
current_pos = dpg.get_drawing_mouse_pos()
if not prev_pos:
prev_pos = current_pos
return

if dpg.is_item_hovered("Canvas"):
color = [255, 0, 0] if dpg.is_key_down(dpg.mvKey_Spacebar) else [255, 255, 255]
canvas_pos = dpg.get_item_pos("Canvas")
p2_pos = (prev_pos[0] - canvas_pos[0], prev_pos[1] - canvas_pos[1])
p1_pos = (current_pos[0] - canvas_pos[0], current_pos[1] - canvas_pos[1])

dpg.draw_line(p1_pos, p2_pos, color=color, parent="Canvas")

prev_pos = current_pos

def main():
dpg.create_context()

with dpg.handler_registry():
dpg.add_mouse_release_handler(callback=release_func)
dpg.add_mouse_drag_handler(callback=drag_func)

with dpg.window(label="Sample", tag="MainWindow"):
dpg.add_drawlist(tag="Canvas", width=WIDTH, height=HEIGHT)

dpg.create_viewport(title='Draw Test', width=WIDTH, height=HEIGHT)
dpg.setup_dearpygui()
dpg.show_viewport()
dpg.set_primary_window("MainWindow", True)
dpg.start_dearpygui()
dpg.destroy_context()

if __name__ == '__main__':
main()
```