[FW][FIX] Highlight: prevent default mousedown behaviour

[fw-bot]

Just like in commit a3b2e7c, we need to prevent the default mousedown behaviour while interacting with the HighlightComponent as it can be active at the same time as the Composer.

Task: /

Description:

description of this task, what is implemented and why it is implemented that way.

Task: : TASK_ID

review checklist

• feature is organized in plugin, or UI components
• support of duplicate sheet (deep copy)
• in model/core: ranges are Range object, and can be adapted (adaptRanges)
• in model/UI: ranges are strings (to show the user)
• undo-able commands (uses this.history.update)
• multiuser-able commands (has inverse commands and transformations where needed)
• new/updated/removed commands are documented
• exportable in excel
• translations (_lt("qmsdf %s", abc))
• unit tested
• clean commented code
• track breaking changes
• doc is rebuild (npm run doc)
• status is correct in Odoo

Forward-Port-Of: #3059

[robodoo]

Pull request status dashboard.

[fw-bot]

This PR targets saas-16.2 and is part of the forward-port chain. Further PRs will be created up to master.

More info at https://github.com/odoo/odoo/wiki/Mergebot#forward-port