links suppoert current default rev context from request 'h'

src/main/java/com/gitblit/wicket/WicketUtils.java

 import org.apache.wicket.Component;
 import org.apache.wicket.PageParameters;
 import org.apache.wicket.Request;
+import org.apache.wicket.RequestCycle;
 import org.apache.wicket.behavior.AttributeAppender;
 import org.apache.wicket.behavior.HeaderContributor;
 import org.apache.wicket.behavior.SimpleAttributeModifier;
 	public static PageParameters newSearchParameter(String repositoryName,
 			String commitId, String search, Constants.SearchType type) {
 		Map<String, String> parameterMap = new HashMap<String, String>();
-		if (StringUtils.isEmpty(commitId)) {
-			parameterMap.put("r", repositoryName);
-			parameterMap.put("s", search);
-			parameterMap.put("st", type.name());
-			return new PageParameters(parameterMap);
-		}
+		setCommitIdIf(commitId, parameterMap);
 		parameterMap.put("r", repositoryName);
-		parameterMap.put("h", commitId);
 		parameterMap.put("s", search);
 		parameterMap.put("st", type.name());
 		return new PageParameters(parameterMap);
 	}
 
+	public static void setCommitIdIf(String commitId, Map<String, String> parameterMap) {
+		if (StringUtils.isEmpty(commitId)) {
+			final String branch = getRequestParameter("h");
+			if (!StringUtils.isEmpty(branch)) {
+				parameterMap.put("h", branch);
+			}
+		}else{
+			parameterMap.put("h", commitId);
+		}
+	}
+
+	protected static String getRequestParameter(final String key) {
+		final HttpServletRequest req = ((WebRequest)RequestCycle.get().getRequest()).getHttpServletRequest();
+		final String branch = req == null ? null : req.getParameter(key);
+		return branch;
+	}	
+	public static void setCommitIdIf(final PageParameters  params) {
+		if( params.get("h") == null ){
+			final String branch = getRequestParameter("h");
+			if (!StringUtils.isEmpty(branch)) {
+				params.put("h", branch);
+			}
+		}
+	}	
 	public static PageParameters newSearchParameter(String repositoryName,
 			String commitId, String search, Constants.SearchType type,
 			int pageNumber) {
 		Map<String, String> parameterMap = new HashMap<String, String>();
-		if (StringUtils.isEmpty(commitId)) {
-			parameterMap.put("r", repositoryName);
-			parameterMap.put("s", search);
-			parameterMap.put("st", type.name());
-			parameterMap.put("pg", String.valueOf(pageNumber));
-			return new PageParameters(parameterMap);
-		}
+		setCommitIdIf(commitId, parameterMap);
 		parameterMap.put("r", repositoryName);
-		parameterMap.put("h", commitId);
 		parameterMap.put("s", search);
 		parameterMap.put("st", type.name());
 		parameterMap.put("pg", String.valueOf(pageNumber));

src/main/java/com/gitblit/wicket/pages/ComparePage.java

 		Repository r = getRepository();
 		RepositoryModel repository = getRepositoryModel();
 
-		if (StringUtils.isEmpty(objectId)) {
+		String[] parts = StringUtils.isEmpty(objectId) ? null :  objectId.split("\\.\\.");
+		if ( parts == null || parts.length < 2) {
 			// seleciton form
 			add(new Label("comparison").setVisible(false));
 		} else {
 			RevCommit fromCommit;
 			RevCommit toCommit;
 
-			String[] parts = objectId.split("\\.\\.");
 			if (parts[0].startsWith("refs/") && parts[1].startsWith("refs/")) {
 				// set the ref models
 				fromRefId.setObject(parts[0]);

src/main/java/com/gitblit/wicket/pages/RepositoryPage.java

 			return navLinks;
 		}
 
+		if( params != null ){
+			WicketUtils.setCommitIdIf(params);
+		}
 		navLinks.add(new PageNavLink("gb.commits", LogPage.class, objectParams));
 		navLinks.add(new PageNavLink("gb.tree", TreePage.class, objectParams));
 		if (app().tickets().isReady() && (app().tickets().isAcceptingNewTickets(model) || app().tickets().hasTickets(model))) {
 			PageParameters tParams = WicketUtils.newOpenTicketsParameter(getRepositoryName());
+			WicketUtils.setCommitIdIf(tParams);
 			navLinks.add(new PageNavLink("gb.tickets", TicketsPage.class, tParams));
 		}
 		navLinks.add(new PageNavLink("gb.docs", DocsPage.class, objectParams, true));