unexpected/unnecessary text refreshing

 Issue Type: <b>Bug</b> 1) From "File"->"Open Recent", you'll get something similar to the attached snapshot, where two lines of text are hightlighted in blue. 2) Keep moving mouse up and down (to simulate choosing a file from the file list), and you will notice quite often that the hightlighted bar on the left (which should stay at the line of "Recent") jumping to other places and quicky moving back to the line of "Open Recent". VS Code version: Code - Insiders 1.52.0-insider (24b28f57be22fe3029cb17a1dd72d8d9c2d6468b, 2020-11-06T05:40:12.937Z) OS version: Linux x64 3.10.0-693.17.1.el7.x86_64 <details> <summary>System Info</summary> |Item|Value| |---|---| |CPUs|Intel(R) Xeon(R) Gold 6130 CPU @ 2.10GHz (32 x 2100)| |GPU Status|2d_canvas: unavailable_software<br>flash_3d: disabled_software<br>flash_stage3d: disabled_software<br>flash_stage3d_baseline: disabled_software<br>gpu_compositing: disabled_software<br>multiple_raster_threads: enabled_on<br>oop_rasterization: disabled_off<br>opengl: disabled_off<br>protected_video_decode: disabled_off<br>rasterization: disabled_software<br>skia_renderer: enabled_on<br>video_decode: disabled_software<br>vulkan: disabled_off<br>webgl: unavailable_software<br>webgl2: unavailable_software| |Load (avg)|2, 1, 1| |Memory (System)|187.41GB (67.15GB free)| |Process Argv|--no-xshm --no-sandbox| |Screen Reader|no| |VM|0%| |DESKTOP_SESSION|undefined| |XDG_CURRENT_DESKTOP|undefined| |XDG_SESSION_DESKTOP|undefined| |XDG_SESSION_TYPE|undefined| </details>Extensions: none <!-- generated by issue reporter -->