functests: Improve tabline click tests

1 files changed, 8 insertions, 6 deletions

diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 4326f770d4..81dbe7548b 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -6022,14 +6022,16 @@ A jump table for the options with a short description can be found at |Q_op|.
 	      using left mouse button on "foo.c" "SwitchBuffer(10, 1, 'l', 
 	      '    ')" expression will be run.  Function receives the 
 	      following arguments in order: minwid field value, number of 
-	      mouse clicks (to detect double clicks), mouse button used: "l" 
-	      or "r" for left and right button respectively, modifiers 
-	      pressed: string which contains "s" if shift modifier was 
-	      pressed, "c" for control, "a" for alt and "m" for meta.  
+	      mouse clicks (to detect double clicks), mouse button used: "l", 
+	      "r" or "m" for left, right or middle button respectively, 
+	      modifiers pressed: string which contains "s" if shift modifier 
+	      was pressed, "c" for control, "a" for alt and "m" for meta.  
 	      Currently if modifier is not pressed string contains space 
-	      instead, but one should not rely on presence of spaces and 
+	      instead, but one should not rely on presence of spaces or 
 	      specific order of modifiers: use |stridx()| to test whether some 
-	      modifier is present.
+	      modifier is present.  One should also not rely on third argument 
+	      being only "l", "r" or "m": any other string value may be 
+	      expected for other mouse buttons.
 	< -   Where to truncate line if too long.  Default is at the start.
 	      No width fields allowed.
 	= -   Separation point between left and right aligned items.