Error when using TextEdit's minimap with horizontal scrolling

[YeldhamDev]

Tested versions

• Reproducible in: 4.3.dev [e7dd6f1] and 4.2.2.stable.

System information

N/A

Issue description

When clicking at the very top of a scrolled down minimap in a TextEdit that has a horizontal scroll visible, something similar to the following error will be in the debugger tab:

E 0:00:02:0536   get_scroll_pos_for_line: Index p_line = -3 is out of bounds (text.size() = 123).
  <C++ Source>   scene/gui/text_edit.cpp:5717 @ get_scroll_pos_for_line()

CC @kitbdev.

Steps to reproduce

• Grab and open the MRP.
• Run the scene.
• Do what's stated above.

Minimal reproduction project (MRP)

minimap-bug.zip