Fixed removal of all colors and issue of canvas size limitation

[itsamrit]

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[unsettledgames]

Hello, thanks for posting, a few things:

• When trying to remove all the colours, instead of alerting the user, the app should probably just remove all the colours but the last one
• The checks in the canvas size aren't really enough at the moment. The canvas size should probably have an upper limit as well (something like 5000 pixels would probably be ok) and it shouldn't let users write alphabetical characters in the input fields. In addition, the checks should be performed on every dialog that requires a canvas size as an input

What I was thinking regarding the previous point (#85 so that it gets referenced there) was having a static function (or its corresponding version in JS) that validates an input field (for example the width or the height of a canvas), given the accepted range and the type of input. The editor shouldn't let users type incorrect values at all, so this validation function would have to be called when the onupdate event of a field is triggered.

Let me know if you want to address this feedback. Otherwise you can just fix the palette removal bug, change the name of this PR and call it a day.

[itsamrit]

Hi, thanks for the feedback. Currently, I am just going to fix the palette removal bug and in coming days I will also fix the canvas size issue as per your feedback.