fixed Backspace not deleting selected text

app/src/main/java/io/github/sspanak/tt9/ime/TypingHandler.java

@@ -135,7 +135,16 @@ public abstract class TypingHandler extends KeyPadHandler {
 			suggestionOps.commitCurrent(false);
 			mInputMode.reset();
 
-			int charsToDelete = settings.getBackspaceAcceleration() && repeat > 0 ? Math.max(textField.getPaddedWordBeforeCursorLength(), 1) : 1;
+			int charsToDelete;
+
+			if (settings.getBackspaceAcceleration() && repeat > 0) {
+				charsToDelete = Math.max(textField.getPaddedWordBeforeCursorLength(), 1);
+			} else if (!textSelection.isEmpty()) {
+				charsToDelete = textSelection.length();
+				textSelection.clear(false);
+			} else {
+				charsToDelete = 1;
+			}
 			textField.deleteChars(charsToDelete);
 		}
 

app/src/main/java/io/github/sspanak/tt9/ime/helpers/TextField.java

@@ -177,7 +177,7 @@ public class TextField extends InputField {
 	 * "deleteSurroundingText()" to delete a region of text or a Unicode character.
 	 */
 	public void deleteChars(int numberOfChars) {
-		if (numberOfChars < 0 || connection == null) {
+		if (numberOfChars <= 0 || connection == null) {
 			return;
 		}
 

app/src/main/java/io/github/sspanak/tt9/ime/helpers/TextSelection.java

@@ -52,6 +52,11 @@ public class TextSelection {
 	}
 
 
+	public int length() {
+		return Math.abs(currentEnd - currentStart);
+	}
+
+
 	public void selectAll() {
 		if (connection != null) {
 			connection.performContextMenuAction(android.R.id.selectAll);