Ignore leading and trailing whitespaces in search keywords

As reported in #58

F-Droid/src/org/fdroid/fdroid/data/AppProvider.java

@@ -497,14 +497,14 @@ public class AppProvider extends FDroidProvider {
     }
 
     private AppQuerySelection querySearch(String keywords) {
-        keywords = "%" + keywords + "%";
+        keywords = "%" + cleanQueryKeywords(keywords) + "%";
         String selection =
                 "fdroid_app.id like ? OR " +
                 "fdroid_app.name like ? OR " +
                 "fdroid_app.summary like ? OR " +
                 "fdroid_app.description like ? ";
-        String[] args = new String[] { keywords, keywords, keywords, keywords};
+        return new AppQuerySelection(selection,
-        return new AppQuerySelection(selection, args);
+                new String[] { keywords, keywords, keywords, keywords });
     }
 
     private AppQuerySelection querySingle(String id) {

F-Droid/src/org/fdroid/fdroid/data/FDroidProvider.java

@@ -142,5 +142,12 @@ public abstract class FDroidProvider extends ContentProvider {
             }
         }
     }
+
+    protected static String cleanQueryKeywords(String keywords) {
+        if (keywords == null) {
+            return null;
+        }
+        return keywords.trim();
+    }
 }
 

F-Droid/src/org/fdroid/fdroid/data/InstalledAppProvider.java

@@ -128,7 +128,9 @@ public class InstalledAppProvider extends FDroidProvider {
     }
 
     private QuerySelection querySearch(String keywords) {
-        return new QuerySelection("applicationLabel LIKE ?", new String[]{ "%" + keywords + "%" });
+        keywords = "%" + cleanQueryKeywords(keywords) + "%";
+        return new QuerySelection("applicationLabel LIKE ?",
+                new String[]{ keywords });
     }
 
     @Override