Allow support of modifiers with links

Fixes #1021

src/Types.ts

@@ -161,6 +161,7 @@ export interface ILinkMatcher {
   matchIndex?: number;
   validationCallback?: LinkMatcherValidationCallback;
   priority?: number;
+  willLinkActivate?: (event: MouseEvent, uri: string) => boolean;
 }
 
 export interface ICharset {
@@ -321,6 +322,13 @@ export interface ILinkMatcherOptions {
    * default value is 0.
    */
   priority?: number;
+  /**
+   * A callback that fires when the mousedown and click events occur that
+   * determines whether a link will be activated upon click. This enables
+   * only activating a link when a certain modifier is held down, if not the
+   * mouse event will continue propagation (eg. double click to select word).
+   */
+  willLinkActivate?: (event: MouseEvent, uri: string) => boolean; 
 }
 
 export interface IBrowser {