[gravitypdf-bot]

Summary

Bumps the plugin version to 6.18.0-RC3, so the third release candidate reports its own version. It's the same two-line change RC2 got in #1957, and the 6.18.0-RC3 tag goes on this PR's merge commit.

• pdf.php: the Version: header and PDF_EXTENDED_VERSION go from 6.18.0-RC2 to 6.18.0-RC3.

RC3 picks up the backports merged since RC2: #1958, #1963, #1964, #1966 and #1968.

Try it

1. Check out this branch and open Plugins in wp-admin: Gravity PDF shows version 6.18.0-RC3.

Test plan

• CI passes
• After merging, tag the merge commit 6.18.0-RC3 and check the published pre-release zip's pdf.php says 6.18.0-RC3

More info

• Stop PDFs crashing on Gravity Forms before 2.8.2 when a field leaves a gap in its row (6.18.0) #1966 merged with its four PHPUnit jobs red. Each one failed in the test bootstrap (Failed opening required '.../gravityformspolls/polls.php'), so the Polls add-on download failed and no tests ran. Add File Upload fields to PDF conditional logic (6.18.0) #1968's green CI ran on a base from before Stop PDFs crashing on Gravity Forms before 2.8.2 when a field leaves a gap in its row (6.18.0) #1966 merged. This PR's CI is the first PHPUnit run over both changes together.
• No other file references 6.18.0-RC2.

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