Add is_selectable to browser window API surface.

desktop/browser.c

@@ -430,6 +430,22 @@ browser_editor_flags browser_window_get_editor_flags(struct browser_window *bw)
 	return ed_flags;
 }
 
+/* exported interface, documented in browser.h */
+bool browser_window_can_select(struct browser_window *bw)
+{
+	if (bw == NULL || bw->current_content == NULL)
+		return false;
+
+	/* TODO: We shouldn't have to know about specific content types
+	 *       here.  There should be a content_is_selectable() call. */
+	if (content_get_type(bw->current_content) != CONTENT_HTML &&
+			content_get_type(bw->current_content) !=
+			CONTENT_TEXTPLAIN)
+		return false;
+
+	return true;
+}
+
 /* exported interface, documented in browser.h */
 char * browser_window_get_selection(struct browser_window *bw)
 {

desktop/browser.h

@@ -453,6 +453,14 @@ struct browser_window * browser_window_get_root(struct browser_window *bw);
  */
 browser_editor_flags browser_window_get_editor_flags(struct browser_window *bw);
 
+/**
+ * Find out if given browser window content is selectable
+ *
+ * \param bw	browser window to look at
+ * \return true iff browser window is selectable
+ */
+bool browser_window_can_select(struct browser_window *bw);
+
 /**
  * Get the current selection from a root browser window, ownership passed to
  * caller, who must free() it.