emphasise when split affects multiple ways

* new icon with two "sciscors" indicates that there will be more than one split perfomed
* the tooltip mentions that one can limit to a single line

closes #8818

data/core.yaml

@@ -468,8 +468,8 @@ en:
             single_node: Divide this line into two at this point.
             multiple_node: Divide this line at these points.
           multiple:
-            single_node: Divide these lines at this point.
-            multiple_node: Divide these lines at these points.
+            single_node: "Divide all lines at this point. Tip: To limit this operation to a specific line, select both the line and point before performing the split."
+            multiple_node: "Divide all lines at these points. Tip: To limit this operation to a specific line, select the line as well as the points before performing the split."
         area:
           single:
             single_node: Divide the edge of this area into two at this point.

modules/operations/split.js

@@ -77,6 +77,14 @@ export function operationSplit(context, selectedIDs) {
         return t('operations.split.annotation.' + _geometry, { n: _ways.length });
     };
 
+    operation.icon = function() {
+        if (_waysAmount === 'multiple') {
+            return '#iD-operation-split-multiple';
+        } else {
+            return '#iD-operation-split';
+        }
+    }
+
 
     operation.id = 'split';
     operation.keys = [t('operations.split.key')];

modules/ui/edit_menu.js

@@ -114,7 +114,7 @@ export function uiEditMenu(context) {
                 .call(tooltip)
                 .append('div')
                 .attr('class', 'icon-wrap')
-                .call(svgIcon('#iD-operation-' + d.id, 'operation'));
+                .call(svgIcon(d.icon && d.icon() || '#iD-operation-' + d.id, 'operation'));
         });
 
         if (showLabels) {

svg/iD-sprite/operations/operation-split-multiple.svg

@@ -0,0 +1,64 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   version="1.1"
+   x="0"
+   y="0"
+   width="20"
+   height="20"
+   viewBox="0 0 20 20"
+   id="svg4"
+   sodipodi:docname="operation-split-multiple.svg"
+   inkscape:version="0.92.5 (2060ec1f9f, 2020-04-08)">
+  <metadata
+     id="metadata10">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <defs
+     id="defs8" />
+  <sodipodi:namedview
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1"
+     objecttolerance="10"
+     gridtolerance="10"
+     guidetolerance="10"
+     inkscape:pageopacity="0"
+     inkscape:pageshadow="2"
+     inkscape:window-width="1884"
+     inkscape:window-height="2096"
+     id="namedview6"
+     showgrid="false"
+     inkscape:zoom="32"
+     inkscape:cx="11.531136"
+     inkscape:cy="22.639016"
+     inkscape:window-x="1956"
+     inkscape:window-y="27"
+     inkscape:window-maximized="0"
+     inkscape:current-layer="svg4" />
+  <path
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+     inkscape:connector-curvature="0"
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