Correct autocompletion for valid identifiers.
Correct autocompletion for valid identifiers.

This regressed with https://crrev.com/c/3310606 where `SPAN_IDENT` was
introduced as a filter for properties to show in the autocompletion box
when using the dot MemberExpression syntax. The `SPAN_IDENT` regex looks
wrong and unnecessarily complicated.

This change uses the ID_Start and ID_Continue unicode property escapes
instead, so we get the right match here.

Fixed: 1324466
Bug: 1275553
Change-Id: I6f0d57771a7370ca761df8a62d488586992e9e3a
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3644947
Auto-Submit: Benedikt Meurer <024a1e0af501338d11c3b837c6193d11c140d792@chromium.org>
Commit-Queue: Benedikt Meurer <024a1e0af501338d11c3b837c6193d11c140d792@chromium.org>
Commit-Queue: Mathias Bynens <17a2cbc4e33156874a9862b0f530521117e66a3d@chromium.org>
Reviewed-by: Mathias Bynens <17a2cbc4e33156874a9862b0f530521117e66a3d@chromium.org>

ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend