According to visibility problem (on viewport breakpoints) with Sider menu in our App
And according to Bootstrap responsive breakpoints https://getbootstrap.com/docs/4.0/layout/overview/#responsive-breakpoints
We should use different values for `min-width` and `max-width`. For example, if we construct query with `min-width: 768px` then we MUST use `max-width: 767.98px` for proper breakpoint determination otherwise they conflict with each other when have similar values.
* feat: use @ant-design/icons@4.0
* feat: use createFromIconfontCN to make site works
* feat: update doc for Icon
* feat: use icon in component Alert
* feat: use icon in component Avatar
* feat: use icon in component Breadcrumb
* feat: use icon in component Button
* feat: use icon in component Cascader
* feat: use icon in component Collapse
* feat: use icon in component Datepicker
* feat: use icon in component Dropdown
* feat: use icon in component Form
* feat: use icon in component Input
* feat: use icon in component InputNumber
* feat: use icon in component Layout
* feat: use icon in component Mention
* feat: use icon in component Message
* feat: use icon in component Modal
* feat: use icon in component Notification
* feat: use icon in component PageHeader
* feat: use icon in component Pagination
* feat: use icon in component Popconfirm
* feat: use icon in component Progress
* feat: use icon in component Rate
* feat: use icon in component Result
* feat: use icon in component Select
* feat: use icon in component Step
* feat: use icon in component Switch
* feat: use icon in component Table
* feat: use icon in component Tab
* feat: use icon in component Tag
* feat: handle rest component which using Icon
* fix: remove unused vars
* feat: use latest alpha ant design icons
* fix: failed test in uploadlist.test.js
* test: update snapshot for icons
* doc: add Icon for site
* doc: use @ant-design/icons in site
* chore: use latest icons
* fix: tslint issue
* fix: test cases
* fix: types for react
* fix: lint rules for import orders
* fix: use @ant-design/icons@4.0.0-alpha.5 to avoid insert css in server render
* fix: eslint error in demo/**.md
* inject antd icons
* update snapshot
* fix site
* doc: update docs
* fix: code snippets icon in site
* feat: use latest @ant-design/icons
* fix: icon props in message
* docs: add api first appearance
* docs: fix auto-complete doc
* docs: replace Version Added with Version
* docs: date picker common method
* docs: date picker common method
* docs: tree
* docs: remove meaningless 3.0.0
* use state instead
* rollback demo markdown
* clean test
* sider context should be clean
* update test case
* fix test
* update debug desc
* add siderCollapsed into omit
* rm useless code
In some situation `Sider` is deeply rendered in Children of `Layout`,
and if we don't want to judge whether `Layout` has sider, the attr `hasSider`
set to `false` should properly work. However `hasSider || this.state.siders.length > 0`
will ignore `hasSider` when it is `false`.