Input dialogs: do not allow blank input cont'd (#7516)

frontend/ui/widget/container/inputcontainer.lua

@@ -287,6 +287,7 @@ function InputContainer:onInput(input, ignore_first_hold_release)
                     text = input.ok_text or _("OK"),
                     is_enter_default = true,
                     callback = function()
+                        if input.deny_blank_input and self.input_dialog:getInputText() == "" then return end
                         input.callback(self.input_dialog:getInputText())
                         self:closeInputDialog()
                     end,

frontend/ui/widget/keyvaluepage.lua

@@ -433,6 +433,7 @@ function KeyValuePage:init()
             hint_func = function()
                 return "(" .. "1 - " .. self.pages .. ")"
             end,
+            deny_blank_input = true,
             callback = function(input)
                 local page = tonumber(input)
                 if page and page >= 1 and page <= self.pages then

frontend/ui/widget/menu.lua

@@ -733,8 +733,8 @@ function Menu:init()
                     local page = tonumber(self.page_info_text.input_dialog:getInputText())
                     if page and page >= 1 and page <= self.page_num then
                         self:onGotoPage(page)
+                        self.page_info_text:closeInputDialog()
                     end
-                    self.page_info_text:closeInputDialog()
                 end,
             },
         },
@@ -754,6 +754,7 @@ function Menu:init()
                     --- @todo Support utf8 lowercase.
                     local filename = FFIUtil.basename(v.path):lower()
                     local search_string = self.page_info_text.input_dialog:getInputText():lower()
+                    if search_string == "" then return end
                     local i, _ = filename:find(search_string)
                     if i == 1 and not v.is_go_up then
                         self:onGotoPage(math.ceil(k / self.perpage))