Fix - clearly assign active tooltis with the pad name

Before when drawing many subpads and actiavte tooltip on one, 
all following pads were activating tooltips. Nicely reproduced with big
canvas example.

Author: linev

scripts/JSRootPainter.js

@@ -4671,7 +4671,8 @@
    TooltipHandler.prototype.IsTooltipShown = function() {
       // return true if tooltip is shown, use to prevent some other action
       if (!this.tooltip_allowed || !this.tooltip_enabled) return false;
-      return ! (this.hints_layer().select(".objects_hints").empty());
+      var hintsg = this.hints_layer().select(".objects_hints");
+      return hintsg.empty() ? false : hintsg.property("hints_pad") == this.pad_name;
    }
 
    TooltipHandler.prototype.ProcessTooltipEvent = function(pnt, enabled) {
@@ -4793,7 +4794,8 @@
 
       // copy transform attributes from frame itself
       hintsg.attr("transform", trans)
-            .property("last_point", pnt);
+            .property("last_point", pnt)
+            .property("hints_pad", this.pad_name);
 
       var viewmode = hintsg.property('viewmode') || "",
           actualw = 0, posx = pnt.x + frame_rect.hint_delta_x;

scripts/JSRootPainter.v6.js

@@ -1650,7 +1650,7 @@
 
       var hintsg = this.hints_layer().select(".objects_hints");
       // if tooltips were visible before, try to reconstruct them after short timeout
-      if (!hintsg.empty() && this.tooltip_allowed)
+      if (!hintsg.empty() && this.tooltip_allowed && (hintsg.property("hints_pad") == this.pad_name))
          setTimeout(this.ProcessTooltipEvent.bind(this, hintsg.property('last_point')), 10);
    }
 

scripts/JSRootPainter.v7.js

@@ -1350,7 +1350,7 @@
 
       var hintsg = this.hints_layer().select(".objects_hints");
       // if tooltips were visible before, try to reconstruct them after short timeout
-      if (!hintsg.empty() && this.tooltip_allowed)
+      if (!hintsg.empty() && this.tooltip_allowed && (hintsg.property("hints_pad") == this.pad_name))
          setTimeout(this.ProcessTooltipEvent.bind(this, hintsg.property('last_point')), 10);
    }