[UX] Gesture manager: add action - fulltext search (#4715)

Fixes #4687.

frontend/apps/reader/modules/readergesture.lua

@@ -42,6 +42,7 @@ local action_strings = {
 
     dictionary_lookup = _("Dictionary lookup"),
     wikipedia_lookup = _("Wikipedia lookup"),
+    fulltext_search = _("Fulltext search"),
 
     full_refresh = _("Full screen refresh"),
     night_mode = _("Night mode"),
@@ -282,6 +283,7 @@ function ReaderGesture:buildMenu(ges, default)
 
         {"dictionary_lookup", true},
         {"wikipedia_lookup", true, true},
+        {"fulltext_search", not self.is_docless, true},
 
         {"full_refresh", true},
         {"night_mode", true},
@@ -567,6 +569,8 @@ function ReaderGesture:gestureAction(action, ges)
         self.ui:handleEvent(Event:new("ShowDictionaryLookup"))
     elseif action == "wikipedia_lookup" then
         self.ui:handleEvent(Event:new("ShowWikipediaLookup"))
+    elseif action == "fulltext_search" then
+        self.ui:handleEvent(Event:new("ShowFulltextSearchInput"))
     elseif action == "show_menu" then
         if self.ges_mode == "gesture_fm" then
             self.ui:handleEvent(Event:new("ShowMenu"))

frontend/apps/reader/modules/readersearch.lua

@@ -21,14 +21,20 @@ end
 function ReaderSearch:addToMainMenu(menu_items)
     menu_items.fulltext_search = {
         text = _("Fulltext search"),
-        tap_input = {
-            title = _("Input text to search for"),
-            ok_text = _("Search all text"),
-            type = "text",
-            callback = function(input)
-                self:onShowSearchDialog(input)
-            end,
-        },
+        callback = function()
+            self:onShowFulltextSearchInput()
+        end,
+    }
+end
+
+function ReaderSearch:onShowFulltextSearchInput()
+    self:onInput{
+        title = _("Enter text to search for"),
+        ok_text = _("Search all text"),
+        type = "text",
+        callback = function(input)
+            self:onShowSearchDialog(input)
+        end,
     }
 end