Mac users with PySimpleGUI, use the following padding for correct scrollable window

PySimpleGUI_Scrollable_Window_macOS.py

'''
As of August 15, 2019, using Python 3.7.4, PySimpleGUI == 4.1.0, macOS 10.14.6, macOS users will have trouble using scrolling or scrollable windows if you are using the Column layout method. The issue is a large portion of the bottom is unable to be in view, unless the user manually resizes the window by at least a few pixels. 



EDIT: The formula works for any layering of elements in a scrollable window! So you can have a row with Text, a row with multiline, a row with buttons. It does not matter. The formula always works!

TL;DR Just add a final element in your layer with top padding like so:
layer += [sg.Text("Whatever you want. Maybe copyright", pad=(0, (22.5 * NUMBER_OF_ROWS - 13.0357, 0)))]

NUMBER_OF_ROWS, not number of elements.



The fix is to add a huge white space with the Text element (i.e. use padding). For example (please don't use this in production): 
'''
layer = []
for i, x in enumerate(range(25)):
    layer += [
        [sg.Text(text=("Row: " + str(i + 1))), sg.Multiline()]
    ]
layer += [[sg.Text(text="Copyright 2019 YoomamaFTW", pad=(0, (450, 0))]]
'''
I've found that the compatibility issue with macOS and PySimpleGUI with Python3.7 regarding window sizes and the content being unable to be "snug fit" can be resolved using a simple linear functions. 

Yes, the padding is a simple y=mx+b function.

Here is the function you'll need to calculate the padding: y = 22.5 * yourVariable - 13.0357 (you can leave out the decimal points).

Issue is based on: https://github.com/PySimpleGUI/PySimpleGUI/issues/1812

The following is:
    1) The function with the algorithm to identify how much padding is needed
    2) The window used for testing
'''                   
# 1
import PySimpleGUI as sg
                   
def mainload():
    number_of_repeats = 25 # Change this number to your liking
    layout = []
    for x in range(number_of_repeats):
        layout += [
            [sg.Text("New input", sg.Multiline()]  # The below formula is dedicated to multiline only 
        ]
    top_padding = 22.5 * number_of_repeats - 13.0357
    layout += [
        [sg.Text("Whatever you want", pad=(0, (top_padding, 0))]
    ]                 
    win_main = sg.Window("Your title", resizable=True) \
        .Layout([[sg.Column(layout-layout, scrollable=True)]])     
    while True:
        event, value = win_main.Read()

if __name__ == '__main__':
   mainload()                     

                 
                 
              
# 2
import PySimpleGUI as sg
                     
def mainload():
    abc = 'abc'
    layout = [
        [sg.Text(text="Alrighty, testing")],
        [sg.OK()]
    ]
    for i, x in enumerate(range(49)):
        layout += [
            [sg.Text("New line: " + str(i + 1)), sg.Multiline()]
        ]
    layout += [
        [sg.Text("White space (can also be made into copyright space :P. Food for thought.)", pad=(0, (1070, 0)))]
    ]
    win_main = sg.Window("Stay Hydrated | Register", resizable=True) \
        .Layout([[sg.Column(layout=layout, scrollable=True)]])
    while True:
      event, value = win_main.Read()

if __name__ == '__main__':
   mainload()

EDIT: The formula works for any layering of elements in a scrollable window! So you can have a row with Text, a row with multiline, a row with buttons. It does not matter. The formula always works!
TL;DR Just add a final element in your layer with top padding like so:

layer += [sg.Text("Whatever you want. Maybe copyright", pad=(0, (22.5 * NUMBER_OF_ROWS - 13.0357, 0)))]
NUMBER_OF_ROWS, not number of elements.