Accidentally entering an invalid character crashes MH #278
Description
I typically go through the sliders by entering single digit adjustments. If I accidentally select only part of it, or miss click for any reason and type in the value with a "." to compensate for what I'm assuming I'm deleting while typing, crashes and I lose all progress.
for example, if I'm changing the scale of the head width and believe I have the full number selected, then type "0.10", not knowing that I have only selected part of the number, python crashes and all progress is lost.
Solution: Display a pop up that says invalid input, or change the colour of the box to red and stop the input from being calculated if it is not a number and/or the there is more than one "." input into the field.
Additionally, an autosave feature would be nice.