When a Language Server doesn't support an end position for a diagnostic (by specifying an end position the same as the start position) Flycheck should be asked to compute the end position using it's flycheck-highlighting-mode setting. This is accomplished by passing nil as the end-column to flycheck-error-new.
This provides consistent behavior between Flymake and Flycheck as the Flymake integration already checks for this condition and uses it's similar functionality (i.e., flymake-diag-region) to compute an end position.
When a Language Server doesn't support an end position for a diagnostic (by specifying an end position the same as the start position) Flycheck should be asked to compute the end position using it's
flycheck-highlighting-modesetting. This is accomplished by passing nil as the end-column toflycheck-error-new.This provides consistent behavior between Flymake and Flycheck as the Flymake integration already checks for this condition and uses it's similar functionality (i.e.,
flymake-diag-region) to compute an end position.