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What it does
This PR aligns the Search and Replace textareas in the Search In Workspace widget with VSCode by adding the hint "(⇅ for history)" to the placeholder labels when the respective textarea has focus.
In addition, because the up and down arrows symbol would look off otherwise, this PR also adds a OS specific class to the body ("mac", "windows" or "linux") to set the --theia-ui-font-family variable accordingly. That behavior, as well as the CSS, was taken over from VSCode.
How to test
Open the Search In Workspace widget and click into the Search and Replace textareas. Make sure they're empty so you can see the dynamic placeholders.
Follow-ups
Review checklist
Reminder for reviewers