Compatibility Grid test tweaks (#12483)

uitest/src/test/java/com/vaadin/tests/components/grid/GridReorderMergedTest.java

         openTestURL();
         GridElement grid = $(GridElement.class).first();
         GridCellElement headerCell0_0 = grid.getHeaderCell(0, 0);
-        GridCellElement headerCell0_4 = grid.getHeaderCell(0, 4);
-        new Actions(driver).dragAndDrop(headerCell0_0, headerCell0_4).perform();
+        // dragAndDrop(headerCell0_0, headerCell0_4) isn't enough for Firefox
+        new Actions(driver).clickAndHold(headerCell0_0)
+                .moveByOffset(headerCell0_0.getSize().getWidth() + 5, 5)
+                .release().perform();
 
         // ensure the first merged block got dragged over the entire second
         // merged block

uitest/src/test/java/com/vaadin/v7/tests/components/grid/GridClientRenderers.java

 import com.vaadin.testbench.elements.NativeButtonElement;
 import com.vaadin.testbench.elements.NativeSelectElement;
 import com.vaadin.testbench.elementsbase.ServerClass;
+import com.vaadin.testbench.parallel.BrowserUtil;
 import com.vaadin.testbench.parallel.TestCategory;
 import com.vaadin.tests.tb3.MultiBrowserTest;
 import com.vaadin.tests.widgetset.client.v7.grid.GridClientColumnRendererConnector.Renderers;
         // Simulate network latency with 2000ms
         latency = 2000;
 
-        // Chrome uses RGB instead of RGBA
+        // Chrome and IE11 use RGBA instead of RGB
         String colorRed = "rgba(255, 0, 0, 1)";
         String colorWhite = "rgba(255, 255, 255, 1)";
         String colorDark = "rgba(245, 245, 245, 1)";
 
+        if (BrowserUtil.isFirefox(desiredCapabilities)) {
+            colorRed = "rgb(255, 0, 0)";
+            colorWhite = "rgb(255, 255, 255)";
+            colorDark = "rgb(245, 245, 245)";
+        }
+
         openTestURL();
 
         getGrid();

uitest/src/test/java/com/vaadin/v7/tests/components/grid/GridHeightTest.java

                             detailsRowHeight, "opened" });
                 }
 
+                // Firefox fails to close the details row if the clicks happen
+                // too close to each other
+                sleep(500);
+
                 grid.getRow(2).click(5, 5);
                 waitForElementNotPresent(By.id("lbl1"));
 

uitest/src/test/java/com/vaadin/v7/tests/components/grid/GridReorderMergedTest.java

         openTestURL();
         GridElement grid = $(GridElement.class).first();
         GridCellElement headerCell0_0 = grid.getHeaderCell(0, 0);
-        GridCellElement headerCell0_4 = grid.getHeaderCell(0, 4);
-        new Actions(driver).dragAndDrop(headerCell0_0, headerCell0_4).perform();
+        // dragAndDrop(headerCell0_0, headerCell0_4) isn't enough for Firefox
+        new Actions(driver).clickAndHold(headerCell0_0)
+                .moveByOffset(headerCell0_0.getSize().getWidth() + 5, 5)
+                .release().perform();
 
         // ensure the first merged block got dragged over the entire second
         // merged block