Source control editor cursor lost control.

[gzx-miller]

Issue Type: Bug

1. Input some commit comments in source control.
2. Select sub-string of the comments, then input new string to replace the selected-string, will cause the commit editor lost responsibility。

VS Code version: Code 1.51.0 (fcac248b077b55bae4ba5bab613fd6e9156c2f0c, 2020-11-05T18:18:23.642Z) OS version: Windows_NT x64 10.0.18363

System Info

|Item|Value| |---|---| |CPUs|Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz (8 x 3600)| |GPU Status|2d_canvas: enabled
flash_3d: enabled
flash_stage3d: enabled
flash_stage3d_baseline: enabled
gpu_compositing: enabled
multiple_raster_threads: enabled_on
oop_rasterization: disabled_off
opengl: enabled_on
protected_video_decode: unavailable_off
rasterization: enabled
skia_renderer: disabled_off_ok
video_decode: enabled
vulkan: disabled_off
webgl: enabled
webgl2: enabled| |Load (avg)|undefined| |Memory (System)|31.93GB (19.70GB free)| |Process Argv|--folder-uri file:///c%3A/CCode/WebNative/xfind_next --crash-reporter-id 2200551b-14cc-4abb-9a43-e043225e0e9a| |Screen Reader|no| |VM|0%|

Extensions (14)

Extension|Author (truncated)|Version ---|---|--- Bookmarks|ale|12.1.2 dart-code|Dar|3.17.1 flutter|Dar|3.17.0 gitlens|eam|11.0.6 vue-snippets|hol|1.0.4 svg|joc|1.4.3 react-native-snippet|jun|0.5.6 vscode-typescript-tslint-plugin|ms-|1.3.3 vetur|oct|0.31.3 vscode-css-peek|pra|4.0.2 react-node-desktop-debugger|rea|2.0.1 vue-vscode-snippets|sdr|2.1.5 gitblame|wad|6.0.2 JavaScriptSnippets|xab|1.8.0

[vscodebot[bot]]

(Experimental duplicate detection) Thanks for submitting this issue. Please also check if it is already covered by an existing one, like:

• Source control editor lost responsibility。 (#114135)

[eamodio]

I can't reproduce this -- Can you still reproduce this on the latest insiders build?