Add new "print tiddler" button for the view toolbar

It works by opening the tiddler in a new window and then triggering the browser print dialogue.

core/language/en-GB/Buttons.multids

@@ -82,6 +82,8 @@ Permaview/Caption: permaview
 Permaview/Hint: Set browser address bar to a direct link to all the tiddlers in this story
 Print/Caption: print page
 Print/Hint: Print the current page
+PrintWindow/Caption: print in new window
+PrintWindow/Hint: Print tiddler in new window
 Refresh/Caption: refresh
 Refresh/Hint: Perform a full refresh of the wiki
 Save/Caption: ok

core/modules/startup/windows.js

@@ -29,6 +29,7 @@ exports.startup = function() {
 			title = event.param || event.tiddlerTitle,
 			paramObject = event.paramObject || {},
 			template = paramObject.template || "$:/core/templates/single.tiddler.window",
+			print = paramObject.print === "yes",
 			width = paramObject.width || "700",
 			height = paramObject.height || "600",
 			variables = $tw.utils.extend({},paramObject,{currentTiddler: title});
@@ -62,6 +63,10 @@ exports.startup = function() {
 		var parser = $tw.wiki.parseTiddler(template),
 			widgetNode = $tw.wiki.makeWidget(parser,{document: srcDocument, parentWidget: $tw.rootWidget, variables: variables});
 		widgetNode.render(srcDocument.body,srcDocument.body.firstChild);
+		// Print the window if required
+		if(print) {
+				srcWindow.print();
+		}
 		// Function to handle refreshes
 		refreshHandler = function(changes) {
 			if(styleWidgetNode.refresh(changes,styleContainer,null)) {

core/ui/ViewToolbar/print-window.tid

@@ -0,0 +1,18 @@
+title: $:/core/ui/Buttons/print-window
+tags: $:/tags/ViewToolbar
+caption: {{$:/core/images/print-button}} {{$:/language/Buttons/PrintWindow/Caption}}
+description: {{$:/language/Buttons/PrintWindow/Hint}}
+
+\whitespace trim
+<$button tooltip={{$:/language/Buttons/PrintWindow/Hint}} aria-label={{$:/language/Buttons/PrintWindow/Caption}} class=<<tv-config-toolbar-class>>>
+<$action-sendmessage $message="tm-open-window" print="yes"/>
+<$list filter="[<tv-config-toolbar-icons>prefix[yes]]">
+{{$:/core/images/print-button}}
+</$list>
+<$list filter="[<tv-config-toolbar-text>prefix[yes]]">
+<span class="tc-btn-text">
+<$text text=" "/>
+<$text text={{$:/language/Buttons/PrintWindow/Caption}}/>
+</span>
+</$list>
+</$button>

editions/tw5.com/tiddlers/messages/WidgetMessage_ tm-open-window.tid

@@ -12,6 +12,7 @@ The `tm-open-window` message opens a tiddler in a new //browser// window. If no
 |template |Template in which the tiddler will be rendered in |
 |width |Width of the new browser window |
 |height |Height of the new browser window |
+|print |Set to "yes" to trigger opening of the browser print dialogue  |
 |paramObject |Hashmap of variables that will be provided to the window  |