Button: don't handle long-press when not enabled

It was only not handled when hold_callback. Do that
also when hold_input/hold_input_func.
Also fix the handling of HoldRelease (as the Hold may
change the state of 'enabled', so we can't rely
on it to guess the Hold is being handled by Button).
Menu: prevent long-press on "No choice available",
as there's then no page to navigate to.

frontend/ui/widget/button.lua

@@ -401,12 +401,21 @@ function Button:refresh()
 end
 
 function Button:onHoldSelectButton()
-    if self.hold_callback and (self.enabled or self.allow_hold_when_disabled) then
-        self.hold_callback()
-    elseif self.hold_input then
-        self:onInput(self.hold_input, true)
-    elseif type(self.hold_input_func) == "function" then
-        self:onInput(self.hold_input_func(), true)
+    -- If we're going to process this hold, we must make
+    -- sure to also handle its hold_release below, so it's
+    -- not propagated up to a MovableContainer
+    self._hold_handled = nil
+    if self.enabled or self.allow_hold_when_disabled then
+        if self.hold_callback then
+            self.hold_callback()
+            self._hold_handled = true
+        elseif self.hold_input then
+            self:onInput(self.hold_input, true)
+            self._hold_handled = true
+        elseif type(self.hold_input_func) == "function" then
+            self:onInput(self.hold_input_func(), true)
+            self._hold_handled = true
+        end
     end
     if self.readonly ~= true then
         return true
@@ -414,12 +423,8 @@ function Button:onHoldSelectButton()
 end
 
 function Button:onHoldReleaseSelectButton()
-    -- Safe-guard for when used inside a MovableContainer,
-    -- which would handle HoldRelease and process it like
-    -- a Hold if we wouldn't return true here
-    if self.hold_callback and (self.enabled or self.allow_hold_when_disabled) then
-        return true
-    elseif self.hold_input or type(self.hold_input_func) == "function" then
+    if self._hold_handled then
+        self._hold_handled = nil
         return true
     end
     return false

frontend/ui/widget/menu.lua

@@ -1024,6 +1024,7 @@ function Menu:updatePageInfo(select_number)
         -- update page information
         if self.page_num > 1 then
             self.page_info_text:setText(FFIUtil.template(_("Page %1 of %2"), self.page, self.page_num))
+            self.page_info_text.enabled = true
         else
             self.page_info_text:setText("");
         end
@@ -1040,6 +1041,7 @@ function Menu:updatePageInfo(select_number)
         self.page_return_arrow:enableDisable(#self.paths > 0)
     else
         self.page_info_text:setText(_("No choices available"))
+        self.page_info_text.enabled = false
     end
 end