Unexpected “Missing or unrecognized delimiter for \bigg” for \uparrow

[pkra]

The following throws a unrecognized delimiter error in v3 but doesn't in v2 or "real" LaTeX.

 \begin{equation*} \begin{array}{ccc}\operatorname {D}(Y) &\xrightarrow {\ \Phi \ } &\operatorname {D}^G(\mathbb{C}^n) \\\bigg {\uparrow }&& \bigg {\uparrow }\\\operatorname {D}_0(Y) &\xrightarrow {\ \Phi \ } &\operatorname {D}^G_0(\mathbb{C}^n) \end{array} \end{equation*}

[dpvc]

The space in \bigg{\uparrow } was not being trimmed, causing the delimiter to be unrecognized.

I have made a PR to resolve the issue.