Fix TextArea cursor dissapearing on Select All when there is no text

Author: wiktor-obrebski

library/lua/gui/widgets/text_area/text_area_content.lua

@@ -98,7 +98,12 @@ function TextAreaContent:setCursor(cursor_offset)
 end
 
 function TextAreaContent:setSelection(from_offset, to_offset)
+    if #self.text == 0 then
+        return
+    end
+
     -- text selection is always start on self.cursor and end on self.sel_end
+
     self:setCursor(from_offset)
     self.sel_end = to_offset
 

test/library/gui/widgets.TextArea.lua

@@ -1655,6 +1655,18 @@ function test.select_all()
     screen:dismiss()
 end
 
+function test.ignore_select_all_for_empty_text()
+    local text_area, screen, window = arrange_textarea({w=65})
+
+    expect.eq(read_rendered_text(text_area), '_');
+
+    simulate_input_keys('CUSTOM_CTRL_A')
+
+    expect.eq(read_rendered_text(text_area), '_');
+
+    screen:dismiss()
+end
+
 function test.text_key_replace_selection()
     local text_area, screen, window = arrange_textarea({w=65})