FV - Slow UI response when resizing
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## Summary
UI response very slow when attempting to resize. This happens on both the Free Pascal IDE, and my application TParted: https://github.com/Kagamma/tparted
Note that this does not occur when running the IDE 3.2.2, or building tparted with fpc 3.2.2, so this is a regression introduced in fpc 3.3.1
## System Information
* **Operating system:** Arch Linux
* **Shell**: fish
* **Terminal**: xfce4-terminal
* **Processor architecture:** x86-64
* **Compiler version:** 3.3.1-19958-g33fe3a02f3
* **Device:** Computer
## Relevant logs and/or screenshots
See the following clip: https://youtu.be/tJcISA1dTrE
## Steps to reproduce
- Open terminal and maximize the window.
- Runs the Free Pascal IDE in terminal.
- Open the editor.
- Attempt to resize it.
## What is the current bug behavior?
UI response very slow when resizing.
## What is the expected (correct) behavior?
UI response smoothly when resizing.
issue