overview: Don't allow the header to shrink
overview: Don't allow the header to shrink

Closes #13432
deryni/cockpit,cockpit-project/cockpit,cockpituous/cockpit,garrett/cockpit,martinpitt/cockpit,mvollmer/cockpit,deryni/cockpit,martinpitt/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,garrett/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,martinpitt/cockpit,moraleslazaro/cockpit,mvollmer/cockpit,deryni/cockpit,garrett/cockpit,deryni/cockpit,cockpit-project/cockpit,cockpituous/cockpit,cockpit-project/cockpit,martinpitt/cockpit,deryni/cockpit,mvollmer/cockpit,mvollmer/cockpit,deryni/cockpit,moraleslazaro/cockpit,deryni/cockpit,mvollmer/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,cockpit-project/cockpit,garrett/cockpit,cockpituous/cockpit,garrett/cockpit,cockpit-project/cockpit,cockpituous/cockpit,martinpitt/cockpit,cockpituous/cockpit