Lua: Expose first and last visible block number

Change-Id: I69b6437dad21269e7623db528a5881d036e3dc87
Reviewed-by: Marcus Tillmanns <marcus.tillmanns@qt.io>

src/plugins/lua/bindings/texteditor.cpp

@@ -466,6 +466,20 @@ void setupTextEditorModule()
                     textEditor && textEditor->editorWidget(),
                     throw sol::error("TextEditor is not valid"));
                 return textEditor->editorWidget()->hasFocus();
+            },
+            "firstVisibleBlockNumber",
+            [](const TextEditorPtr &textEditor) -> int {
+                QTC_ASSERT(
+                    textEditor && textEditor->editorWidget(),
+                    throw sol::error("TextEditor is not valid"));
+                return textEditor->editorWidget()->firstVisibleBlockNumber();
+            },
+            "lastVisibleBlockNumber",
+            [](const TextEditorPtr &textEditor) -> int {
+                QTC_ASSERT(
+                    textEditor && textEditor->editorWidget(),
+                    throw sol::error("TextEditor is not valid"));
+                return textEditor->editorWidget()->lastVisibleBlockNumber();
             });
 
         result["Side"] = lua.create_table_with(

src/plugins/lua/meta/texteditor.lua

@@ -237,6 +237,14 @@ function TextEditor:insertText(text) end
 ---@return boolean hasFocus True if the editor widget has focus, false otherwise.
 function TextEditor:hasFocus() end
 
+---Returns the block number of the first visible line in the text editor.
+---@return integer blockNumber The block number of the first visible line.
+function TextEditor:firstVisibleBlockNumber() end
+
+---Returns the block number of the last visible line in the text editor.
+---@return integer blockNumber The block number of the last visible line.
+function TextEditor:lastVisibleBlockNumber() end
+
 ---Returns the current editor or nil.
 ---@return TextEditor|nil editor The currently active editor or nil if there is none.
 function textEditor.currentEditor() end