layers: LX222, suppress warning on partial CmdClearAttachment calls

Drawstate will warn if this call is made in a renderpass BEFORE making a draw
call. However, this is OK if only a subset of the attachment is being cleared.
diff --git a/layers/draw_state.cpp b/layers/draw_state.cpp
index 2dd1542..4cccdd1 100644
--- a/layers/draw_state.cpp
+++ b/layers/draw_state.cpp
@@ -4242,8 +4242,10 @@
     GLOBAL_CB_NODE* pCB = getCBNode(dev_data, commandBuffer);
     if (pCB) {
         if (pCB->state == CB_UPDATE_ACTIVE) {
-            // Warn if this is issued prior to Draw Cmd
-            if (!hasDrawCmd(pCB)) {
+            // Warn if this is issued prior to Draw Cmd and clearing the entire attachment
+            if (!hasDrawCmd(pCB)                                                                         &&
+                (pCB->activeRenderPassBeginInfo.renderArea.extent.width  == pRects[0].rect.extent.width) &&
+                (pCB->activeRenderPassBeginInfo.renderArea.extent.height == pRects[0].rect.extent.height)) {
                 // TODO : commandBuffer should be srcObj
                 skipCall |= log_msg(dev_data->report_data, VK_DBG_REPORT_WARN_BIT, VK_OBJECT_TYPE_COMMAND_BUFFER, 0, 0, DRAWSTATE_CLEAR_CMD_BEFORE_DRAW, "DS",
                         "vkCmdClearAttachments() issued on CB object 0x%" PRIxLEAST64 " prior to any Draw Cmds."