Specify calendar when we open editor

CCBUG: 429546
1 job for release/20.12 in 5 minutes and 51 seconds (queued for 5 minutes and 47 seconds)
Status Job ID Name Coverage
failed build_clazy_clang_tidy #79595


Name Stage Failure
build_clazy_clang_tidy Build
-- Configuring incomplete, errors occurred!
See also "/builds/pim/kdepim-addons/build/CMakeFiles/CMakeOutput.log".
See also "/builds/pim/kdepim-addons/build/CMakeFiles/CMakeError.log".
Uploading artifacts for failed job
Uploading artifacts...
WARNING: JUnitTestResults.xml: no matching files
ERROR: No files to upload
Cleaning up file based variables
ERROR: Job failed: exit code 1