Fix: Rubric error when jumping to previous word and string begins with separators #18208
+34
−18
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When a RubTextEditor has a string that begins with separators, and the cursor is somewhere in those, and we jump to the previous word, there is an OutOfBounds exception.
Fixed by moving the range check after the loop that ignores initial separators.
Also added tests for that case, as well as for jumping to the next word, which already works but wasn't tested.