Disable "Select All" button for empty input

Just like other buttons on this dialog.

Fixes #1046

Author: mickaelistria

bundles/org.eclipse.ui.workbench.texteditor/src/org/eclipse/ui/texteditor/FindReplaceDialog.java

@@ -1693,6 +1693,7 @@ private void updateButtonState(boolean disableReplace) {
 			fWholeWordCheckBox.setEnabled(isWord(str) && !isRegExSearchAvailableAndChecked());
 
 			fFindNextButton.setEnabled(enable && findString);
+			fSelectAllButton.setEnabled(enable && findString && fTarget instanceof IFindReplaceTargetExtension4);
 			fReplaceSelectionButton.setEnabled(!disableReplace && enable && isEditable() && selection && (!fNeedsInitialFindBeforeReplace || !isRegExSearchAvailableAndChecked()));
 			fReplaceFindButton.setEnabled(!disableReplace && enable && isEditable() && findString && selection && (!fNeedsInitialFindBeforeReplace || !isRegExSearchAvailableAndChecked()));
 			fReplaceAllButton.setEnabled(enable && isEditable() && findString);
@@ -1834,12 +1835,8 @@ public void updateTarget(IFindReplaceTarget target, boolean isTargetEditable, bo
 				fGiveFocusToFindField= true;
 			}
 			initIncrementalBaseLocation();
-			updateButtonState();
-		}
-
-		if (okToUse(fSelectAllButton)) {
-			fSelectAllButton.setEnabled(fTarget instanceof IFindReplaceTargetExtension4);
 		}
+		updateButtonState();
 
 		setContentAssistsEnablement(isRegExSearchAvailableAndChecked());
 	}