From 9e6b175519dbcc78303d7315ffb08c6a53488156 Mon Sep 17 00:00:00 2001
From: Ilya Sarantsev <ilya.sarantsev@gmail.com>
Date: Mon, 21 Aug 2017 18:55:42 +0300
Subject: [PATCH 1/7] Handle shared attributes object in hyperscript (#1941)

---
 docs/change-log.md               |  1 +
 render/hyperscript.js            | 12 ++++++++++++
 render/tests/test-hyperscript.js | 17 +++++++++++++++++
 3 files changed, 30 insertions(+)

diff --git a/docs/change-log.md b/docs/change-log.md
index 82686f0e..e73ff1b6 100644
--- a/docs/change-log.md
+++ b/docs/change-log.md
@@ -36,6 +36,7 @@
 #### Bug fixes:
 
 - core: don't call `onremove` on the children of components that return null from the view [#1921](https://github.com/MithrilJS/mithril.js/issues/1921) [octavore](https://github.com/octavore) ([#1922](https://github.com/MithrilJS/mithril.js/pull/1922))
+- hypertext: correct handling of shared attributes object passed to `m()`. Will copy attributes when it's necessary [#1941](https://github.com/MithrilJS/mithril.js/issues/1941) [s-ilya](https://github.com/s-ilya) ([#1942](https://github.com/MithrilJS/mithril.js/pull/1942))
 
 ---
 
diff --git a/render/hyperscript.js b/render/hyperscript.js
index 5b5fda29..ea56c893 100644
--- a/render/hyperscript.js
+++ b/render/hyperscript.js
@@ -28,6 +28,18 @@ function execSelector(state, attrs, children) {
 	var hasAttrs = false, childList, text
 	var className = attrs.className || attrs.class
 
+	if (Object.keys(state.attrs).length && Object.keys(attrs).length) {
+		var newAttrs = {}
+
+		for(var key in attrs) {
+			if (hasOwn.call(attrs, key)) {
+				newAttrs[key] = attrs[key]
+			}
+		}
+
+		attrs = newAttrs
+	}
+
 	for (var key in state.attrs) {
 		if (hasOwn.call(state.attrs, key)) {
 			attrs[key] = state.attrs[key]
diff --git a/render/tests/test-hyperscript.js b/render/tests/test-hyperscript.js
index 498a9dbf..f7c5f889 100644
--- a/render/tests/test-hyperscript.js
+++ b/render/tests/test-hyperscript.js
@@ -507,6 +507,23 @@ o.spec("hyperscript", function() {
 			o(vnode.children[0].tag).equals("i")
 			o(vnode.children[1].tag).equals("s")
 		})
+		o("handles shared attrs", function() {
+			var attrs = {a: "b"}
+
+			var nodeA = m(".a", attrs)
+			var nodeB = m(".b", attrs)
+
+			o(nodeA.attrs.className).equals("a")
+			o(nodeA.attrs.a).equals("b")
+
+			o(nodeB.attrs.className).equals("b")
+			o(nodeB.attrs.a).equals("b")
+		})
+		o("doesnt modify passed attributes object", function() {
+			var attrs = {a: "b"}
+			m(".a", attrs)
+			o(attrs).deepEquals({a: "b"})
+		})
 		o("handles fragment children without attr unwrapped", function() {
 			var vnode = m("div", [m("i")], [m("s")])
 

From 106fd7514572d7ea600dd6493290414bbec6e4a5 Mon Sep 17 00:00:00 2001
From: Ilya Sarantsev <ilya.sarantsev@gmail.com>
Date: Sat, 26 Aug 2017 22:42:29 +0300
Subject: [PATCH 2/7] Performance optimization for #1941 per @isiahmeadows
 suggestion

---
 render/hyperscript.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/render/hyperscript.js b/render/hyperscript.js
index ea56c893..00c438c9 100644
--- a/render/hyperscript.js
+++ b/render/hyperscript.js
@@ -6,6 +6,11 @@ var selectorParser = /(?:(^|#|\.)([^#\.\[\]]+))|(\[(.+?)(?:\s*=\s*("|'|)((?:\\["
 var selectorCache = {}
 var hasOwn = {}.hasOwnProperty
 
+function isEmpty(object) {
+	for (var key in object) if (hasOwn.call(object, key)) return false
+	return true
+}
+
 function compileSelector(selector) {
 	var match, tag = "div", classes = [], attrs = {}
 	while (match = selectorParser.exec(selector)) {
@@ -28,7 +33,7 @@ function execSelector(state, attrs, children) {
 	var hasAttrs = false, childList, text
 	var className = attrs.className || attrs.class
 
-	if (Object.keys(state.attrs).length && Object.keys(attrs).length) {
+	if (!isEmpty(state.attrs) && !isEmpty(attrs)) {
 		var newAttrs = {}
 
 		for(var key in attrs) {

From 19969e25558ac7d68d86dcad614d918f9fc132b1 Mon Sep 17 00:00:00 2001
From: Gandalf-the-Bot <gandalfthebot@py.gy>
Date: Sun, 27 Aug 2017 13:57:53 +0000
Subject: [PATCH 3/7] Bundled output for commit
 c9629ffcbca3ac535c675ee1b4d29c0b6bb07bb4 [skip ci]

---
 README.md      |  2 +-
 mithril.js     | 13 ++++++++
 mithril.min.js | 89 +++++++++++++++++++++++++-------------------------
 3 files changed, 59 insertions(+), 45 deletions(-)

diff --git a/README.md b/README.md
index 6ddbbb0a..d96eb04b 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ mithril.js [![NPM Version](https://img.shields.io/npm/v/mithril.svg)](https://ww
 
 ## What is Mithril?
 
-A modern client-side Javascript framework for building Single Page Applications. It's small (<!-- size -->8.29 KB<!-- /size --> gzipped), fast and provides routing and XHR utilities out of the box.
+A modern client-side Javascript framework for building Single Page Applications. It's small (<!-- size -->8.33 KB<!-- /size --> gzipped), fast and provides routing and XHR utilities out of the box.
 
 Mithril is used by companies like Vimeo and Nike, and open source platforms like Lichess 👍.
 
diff --git a/mithril.js b/mithril.js
index e2c8944e..03d2224e 100644
--- a/mithril.js
+++ b/mithril.js
@@ -17,6 +17,10 @@ Vnode.normalizeChildren = function normalizeChildren(children) {
 var selectorParser = /(?:(^|#|\.)([^#\.\[\]]+))|(\[(.+?)(?:\s*=\s*("|'|)((?:\\["'\]]|.)*?)\5)?\])/g
 var selectorCache = {}
 var hasOwn = {}.hasOwnProperty
+function isEmpty(object) {
+	for (var key in object) if (hasOwn.call(object, key)) return false
+	return true
+}
 function compileSelector(selector) {
 	var match, tag = "div", classes = [], attrs = {}
 	while (match = selectorParser.exec(selector)) {
@@ -37,6 +41,15 @@ function compileSelector(selector) {
 function execSelector(state, attrs, children) {
 	var hasAttrs = false, childList, text
 	var className = attrs.className || attrs.class
+	if (!isEmpty(state.attrs) && !isEmpty(attrs)) {
+		var newAttrs = {}
+		for(var key in attrs) {
+			if (hasOwn.call(attrs, key)) {
+				newAttrs[key] = attrs[key]
+			}
+		}
+		attrs = newAttrs
+	}
 	for (var key in state.attrs) {
 		if (hasOwn.call(state.attrs, key)) {
 			attrs[key] = state.attrs[key]
diff --git a/mithril.min.js b/mithril.min.js
index 05686d0c..9b3d144a 100644
--- a/mithril.min.js
+++ b/mithril.min.js
@@ -1,44 +1,45 @@
-(function(){function y(b,d,f,m,q,h){return{tag:b,key:d,attrs:f,children:m,text:q,dom:h,domSize:void 0,state:void 0,_state:void 0,events:void 0,instance:void 0,skip:!1}}function A(b){var d,f=arguments[1],m=2;if(null==b||"string"!==typeof b&&"function"!==typeof b&&"function"!==typeof b.view)throw Error("The selector must be either a string or a component.");if("string"===typeof b&&!(d=M[b])){var q="div";for(var h=[],k={};d=Q.exec(b);){var r=d[1],g=d[2];""===r&&""!==g?q=g:"#"===r?k.id=g:"."===r?h.push(g):
-"["===d[3][0]&&((r=d[6])&&(r=r.replace(/\\(["'])/g,"$1").replace(/\\\\/g,"\\")),"class"===d[4]?h.push(r):k[d[4]]=""===r?r:r||!0)}0<h.length&&(k.className=h.join(" "));d=M[b]={tag:q,attrs:k}}if(null==f)f={};else if("object"!==typeof f||null!=f.tag||Array.isArray(f))f={},m=1;if(arguments.length===m+1)q=arguments[m],Array.isArray(q)||(q=[q]);else for(q=[];m<arguments.length;)q.push(arguments[m++]);m=y.normalizeChildren(q);if("string"===typeof b){q=!1;var n,p;h=f.className||f["class"];for(var a in d.attrs)N.call(d.attrs,
-a)&&(f[a]=d.attrs[a]);void 0!==h&&(void 0!==f["class"]&&(f["class"]=void 0,f.className=h),null!=d.attrs.className&&(f.className=d.attrs.className+" "+h));for(a in f)if(N.call(f,a)&&"key"!==a){q=!0;break}Array.isArray(m)&&1===m.length&&null!=m[0]&&"#"===m[0].tag?p=m[0].children:n=m;return y(d.tag,f.key,q?f:void 0,n,p)}return y(b,f.key,f,m)}function R(b){var d=0,f=null,m="function"===typeof requestAnimationFrame?requestAnimationFrame:setTimeout;return function(){var q=Date.now()-d;null===f&&(f=m(function(){f=
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+0===a.indexOf(e.prefix)&&(a=a.slice(e.prefix.length)),m.set(a,void 0,void 0))}};m.param=function(b){return"undefined"!==typeof g&&"undefined"!==typeof b?g[b]:g};return m}(window,I);A.withAttr=function(b,d,e){return function(k){d.call(e||this,b in k.currentTarget?k.currentTarget[b]:k.currentTarget.getAttribute(b))}};var W=Q(window);A.render=W.render;A.redraw=I.redraw;A.request=L.request;A.jsonp=L.jsonp;A.parseQueryString=M;A.buildQueryString=H;A.version="1.1.3";A.vnode=y;"undefined"!==typeof module?
+module.exports=A:window.m=A})();
\ No newline at end of file

From 849e862413311ea2d8bad1b4c26e88230e4d9135 Mon Sep 17 00:00:00 2001
From: Jackson Nowotny <jackson.nowotny2@cerner.com>
Date: Tue, 22 Aug 2017 14:04:24 -0500
Subject: [PATCH 4/7] Fixing IE bug causing active element to be null causing
 render function to throw error

---
 docs/change-log.md | 1 +
 render/render.js   | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/docs/change-log.md b/docs/change-log.md
index e73ff1b6..05c1e601 100644
--- a/docs/change-log.md
+++ b/docs/change-log.md
@@ -28,6 +28,7 @@
 - API: `m.route.set()` causes all mount points to be redrawn ([#1592](https://github.com/MithrilJS/mithril.js/pull/1592))
 - API: If a user sets the Content-Type header within a request's options, that value will be the entire header value rather than being appended to the default value ([#1924](https://github.com/MithrilJS/mithril.js/pull/1924))
 - API: Using style objects in hyperscript calls will now properly diff style properties from one render to another as opposed to re-writing all element style properties every render.
+- Fix IE11 active element is null causing render function to throw error.
 
 ---
 
diff --git a/render/render.js b/render/render.js
index f6782297..0a5938d6 100644
--- a/render/render.js
+++ b/render/render.js
@@ -630,7 +630,7 @@ module.exports = function($window) {
 		updateNodes(dom, dom.vnodes, Vnode.normalizeChildren(vnodes), false, hooks, null, namespace === "http://www.w3.org/1999/xhtml" ? undefined : namespace)
 		dom.vnodes = vnodes
 		for (var i = 0; i < hooks.length; i++) hooks[i]()
-		if ($doc.activeElement !== active) active.focus()
+		if (active !== null && $doc.activeElement !== active) active.focus()
 	}
 
 	return {render: render, setEventCallback: setEventCallback}

From aaa448ac4e84afcfc791a733f48f68d8e288571e Mon Sep 17 00:00:00 2001
From: Jackson Nowotny <jackson.nowotny2@cerner.com>
Date: Tue, 22 Aug 2017 15:51:47 -0500
Subject: [PATCH 5/7] adding comment specifying bug

---
 render/render.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/render/render.js b/render/render.js
index 0a5938d6..c733f9fc 100644
--- a/render/render.js
+++ b/render/render.js
@@ -630,6 +630,7 @@ module.exports = function($window) {
 		updateNodes(dom, dom.vnodes, Vnode.normalizeChildren(vnodes), false, hooks, null, namespace === "http://www.w3.org/1999/xhtml" ? undefined : namespace)
 		dom.vnodes = vnodes
 		for (var i = 0; i < hooks.length; i++) hooks[i]()
+		// document.activeElement can return null in IE https://developer.mozilla.org/en-US/docs/Web/API/Document/activeElement
 		if (active !== null && $doc.activeElement !== active) active.focus()
 	}
 

From 5303e70fde7aa115af4727b52dc8cb728373d001 Mon Sep 17 00:00:00 2001
From: Jackson Nowotny <jackson.nowotny2@cerner.com>
Date: Tue, 29 Aug 2017 10:30:45 -0500
Subject: [PATCH 6/7] fixing merge conflicts

---
 docs/change-log.md | 2 +-
 render/render.js   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/docs/change-log.md b/docs/change-log.md
index 05c1e601..5b30bb0a 100644
--- a/docs/change-log.md
+++ b/docs/change-log.md
@@ -28,7 +28,6 @@
 - API: `m.route.set()` causes all mount points to be redrawn ([#1592](https://github.com/MithrilJS/mithril.js/pull/1592))
 - API: If a user sets the Content-Type header within a request's options, that value will be the entire header value rather than being appended to the default value ([#1924](https://github.com/MithrilJS/mithril.js/pull/1924))
 - API: Using style objects in hyperscript calls will now properly diff style properties from one render to another as opposed to re-writing all element style properties every render.
-- Fix IE11 active element is null causing render function to throw error.
 
 ---
 
@@ -38,6 +37,7 @@
 
 - core: don't call `onremove` on the children of components that return null from the view [#1921](https://github.com/MithrilJS/mithril.js/issues/1921) [octavore](https://github.com/octavore) ([#1922](https://github.com/MithrilJS/mithril.js/pull/1922))
 - hypertext: correct handling of shared attributes object passed to `m()`. Will copy attributes when it's necessary [#1941](https://github.com/MithrilJS/mithril.js/issues/1941) [s-ilya](https://github.com/s-ilya) ([#1942](https://github.com/MithrilJS/mithril.js/pull/1942))
+- Fix IE bug where active element is null causing render function to throw error. ([1943](https://github.com/MithrilJS/mithril.js/pull/1943))
 
 ---
 
diff --git a/render/render.js b/render/render.js
index c733f9fc..cc6afd51 100644
--- a/render/render.js
+++ b/render/render.js
@@ -631,7 +631,7 @@ module.exports = function($window) {
 		dom.vnodes = vnodes
 		for (var i = 0; i < hooks.length; i++) hooks[i]()
 		// document.activeElement can return null in IE https://developer.mozilla.org/en-US/docs/Web/API/Document/activeElement
-		if (active !== null && $doc.activeElement !== active) active.focus()
+		if (active != null && $doc.activeElement !== active) active.focus()
 	}
 
 	return {render: render, setEventCallback: setEventCallback}

From 67e1aad944efa4ba82f1a9d9b404b0bb7ec0fc19 Mon Sep 17 00:00:00 2001
From: Gandalf-the-Bot <gandalfthebot@py.gy>
Date: Wed, 30 Aug 2017 11:59:27 +0000
Subject: [PATCH 7/7] Bundled output for commit
 11183f339d9430da22ab14b9f3bfb5f37df722f8 [skip ci]

---
 README.md      |  2 +-
 mithril.js     |  3 ++-
 mithril.min.js | 20 ++++++++++----------
 3 files changed, 13 insertions(+), 12 deletions(-)

diff --git a/README.md b/README.md
index d96eb04b..30e9ab21 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ mithril.js [![NPM Version](https://img.shields.io/npm/v/mithril.svg)](https://ww
 
 ## What is Mithril?
 
-A modern client-side Javascript framework for building Single Page Applications. It's small (<!-- size -->8.33 KB<!-- /size --> gzipped), fast and provides routing and XHR utilities out of the box.
+A modern client-side Javascript framework for building Single Page Applications. It's small (<!-- size -->8.32 KB<!-- /size --> gzipped), fast and provides routing and XHR utilities out of the box.
 
 Mithril is used by companies like Vimeo and Nike, and open source platforms like Lichess 👍.
 
diff --git a/mithril.js b/mithril.js
index 03d2224e..42d5cbb4 100644
--- a/mithril.js
+++ b/mithril.js
@@ -991,7 +991,8 @@ var coreRenderer = function($window) {
 		updateNodes(dom, dom.vnodes, Vnode.normalizeChildren(vnodes), false, hooks, null, namespace === "http://www.w3.org/1999/xhtml" ? undefined : namespace)
 		dom.vnodes = vnodes
 		for (var i = 0; i < hooks.length; i++) hooks[i]()
-		if ($doc.activeElement !== active) active.focus()
+		// document.activeElement can return null in IE https://developer.mozilla.org/en-US/docs/Web/API/Document/activeElement
+		if (active != null && $doc.activeElement !== active) active.focus()
 	}
 	return {render: render, setEventCallback: setEventCallback}
 }
diff --git a/mithril.min.js b/mithril.min.js
index 9b3d144a..0f005532 100644
--- a/mithril.min.js
+++ b/mithril.min.js
@@ -33,13 +33,13 @@ c,d);else if("style"===c)if(a=b,null!=a&&null!=d&&"object"===typeof a&&"object"=
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