Window collapse/expand icons are confusing

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#1,021 建立於 2018年11月27日 0 則留言 0 個 reaction 已指派 0 人在 GitHub 檢視

enhancement module:components P2: important

描述

### Issue type

**I'm submitting a ...** (check one with "x")

* [] bug report
* [x] feature request

### Issue description

Make window content toggle process more straightforward. Probably we can change icons and simplify logic to proposed in #1003.

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