InputNumber: fix formatting of currencies with suffix #3999
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Currently if you enter a negative number in the InputNumber field (with formatting set to a currency with a suffix), the input becomes doubled (f.e. if you type -1, it becomes -11). This is because there is a missing check if decimalCharIndex is valid or not.
Unfortunately I did not find a solution for writing a test, that covers this bug, because this relies on the keydown event handling of input fields (which vue-test-utils does not support at the time). If you have an idea how to fix this, please let me know, I am happy to write a test for this issue.
Fix #3382