InputDialog: add 'use_available_height' option (#8467)

Use it with bookmark edit, to allow entering longer notes.

frontend/apps/reader/modules/readerbookmark.lua

@@ -893,8 +893,8 @@ function ReaderBookmark:renameBookmark(item, from_highlight)
         description = "   " .. T(_("Page: %1"), bookmark.mandatory) .. "     " .. T(_("Time: %1"), bookmark.datetime),
         input = bookmark.text_orig,
         allow_newline = true,
-        cursor_at_end = false,
         add_scroll_buttons = true,
+        use_available_height = true,
         buttons = {
             {
                 {

frontend/ui/widget/inputdialog.lua

@@ -133,6 +133,7 @@ local InputDialog = InputContainer:new{
     readonly = false, -- don't allow editing, will not show keyboard
     allow_newline = false, -- allow entering new lines (this disables any enter_callback)
     cursor_at_end = true, -- starts with cursor at end of text, ready for appending
+    use_available_height = false, -- adjust input box to fill available height on screen
     fullscreen = false, -- adjust to full screen minus keyboard
     condensed = false, -- true will prevent adding air and balance between elements
     add_scroll_buttons = false, -- add scroll Up/Down buttons to first row of buttons
@@ -347,7 +348,7 @@ function InputDialog:init()
                                     - vspan_after_input_text:getSize().h
                                     - buttons_container:getSize().h
                                     - keyboard_height
-        if self.fullscreen or text_height > available_height then
+        if self.fullscreen or self.use_available_height or text_height > available_height then
             -- Don't leave unusable space in the text widget, as the user could think
             -- it's an empty line: move that space in pads after and below (for centering)
             self.text_height = math.floor(available_height / line_height) * line_height
@@ -356,7 +357,9 @@ function InputDialog:init()
             local pad_after = pad_height - pad_before
             vspan_before_input_text.width = vspan_before_input_text.width + pad_before
             vspan_after_input_text.width = vspan_after_input_text.width + pad_after
-            self.cursor_at_end = false -- stay at start if overflowed
+            if text_height > available_height then
+                self.cursor_at_end = false -- stay at start if overflowed
+            end
         else
             -- Don't leave unusable space in the text widget
             self.text_height = text_height