fix: ensure reloadButton disabled when none selected

Addressing a regression in 3.6.2 whereby the reload button was
inadvertently enabled when no items were selected. Also fixup the
doReloadTabs action so it filters-out discarded items rather than
filters them in.

Author: dnwe

Makefile

@@ -1,5 +1,5 @@
 TARGET=firefox
-VERSION=3.6.3
+VERSION=3.6.4
 
 TDIR=build/${TARGET}
 TBDIR=$(TDIR)/build

popup/tabhunter.js.erb

@@ -1198,7 +1198,7 @@ function updateButtons() {
     document.getElementById("go").disabled = selectedItemLength != 1 || matchedItemLength == 0;
     closeTabsButton.disabled = otherDisabled;
     const selectedActualIndices = selectedItems.map(elt => elt.actualIndex);
-    reloadTabsButton.disabled = selectedActualIndices.some(i => items[i].discarded);
+    reloadTabsButton.disabled = selectedItemLength == 0 || selectedActualIndices.some(i => items[i].discarded);
     selectAllButton.disabled = matchedItems.length == 0;
     document.getElementById("copyURL").disabled = otherDisabled;
     document.getElementById("copyTitle").disabled = otherDisabled;
@@ -1594,7 +1594,7 @@ function activateTheTabs() {
 
 function doReloadTabs() {
     var selectedItems = getSelectedItemsJQ();
-    var selectedActualIndices = selectedItems.filter(item => item.discarded).map(function(elt) { return elt.actualIndex });
+    var selectedActualIndices = selectedItems.filter(item => !item.discarded).map(function(elt) { return elt.actualIndex });
     var actualItems = selectedActualIndices.map((i) => items[i]);
     var tabIDs = actualItems.map((item) => item.tabID);
     if (tabIDs.length == 0) {