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9a07b1b79d
When adding tabs in modal dialogues, the old code of simply assigning s.tabs = this.tabs was problematic because it was an array of objects whose behaviour would cause a traceback when s.tab is called in e.g. a protocol handler Modal when it was reopened. Now verify the properties do not already exist before assigning them. This means one can define s.tab(...) in a Modal UI without a try block (which would even then sometimes fail). Signed-off-by: Paul Donald <newtwen+github@gmail.com>