[kmplot] doc: Document drag and drop in the function list

[Yuri Chornoivan]

Git commit 4f8d2af771676ea044a91d1c1b47a3cb7c09f60c by Yuri Chornoivan.
Committed on 24/12/2018 at 13:38.
Pushed by yurchor into branch 'master'.

Document drag and drop in the function list

BUG: 313405
Differential Revision: https://phabricator.kde.org/D17753

M  +4    -0    doc/index.docbook

https://commits.kde.org/kmplot/4f8d2af771676ea044a91d1c1b47a3cb7c09f60c

diff --git a/doc/index.docbook b/doc/index.docbook
index 645f89e..13b7b4c 100644
--- a/doc/index.docbook
+++ b/doc/index.docbook
@@ -135,6 +135,10 @@ url="http://edu.kde.org/">http://edu.kde.org/</ulink></para></abstract>
 		to get another plot.
 	</para>
 
+	<para>
+		Drag and drop the item <userinput>y = 5sin(x)</userinput> in the left sidebar to clone the plot. Replace <userinput>sin</userinput> with <userinput>cos</userinput> to get the cosine plot of the same color.
+	</para>
+
 	<para>Click on one of the lines you have just plotted. Now the crosshair
 		becomes the color of the current plot and is attached to the it.  You can
 		use the mouse to move the crosshair along the plot.  In the status