What is Alt + Backspace keyboard shortcut for?

Windows 3.1 - Undo last command  

Firefox - Undo  

Brackets - (Windows only) Delete To Line Start  

Notepad2 - Undo  

Micro 2.0.13 (text editor) - Delete word left  

Helix 23.10 - Delete previous word  

Helix 23.10 - Delete previous word  

Ace Editor - Remove to linestart  

QOwnNotes 19.10.10 - Delete line  

Notepad3 (v5.21) - Undo.  

Photopea 5.4 - Fill  

CorelDRAW 2020 - Cancel the previous action.  

Adobe Premiere Pro (Windows) - Ripple Delete  

Blender 3.4.1 - Insert text  

Adobe Lightroom Classic - Remove selected photo(s) from catalog  

SketchUp 2022 Pro - Undo  

CorelDRAW Graphics Suite 2018 - Undo  

MarvinSketch - Undo  

Notepad++ - Undo  

SQL Server Management Studio (SSMS) - Reverse the last editing action  

HeidiSQL - Undo  

Delphi - Undo  

Microsoft Visual Studio 2017 (All shortcuts) - Edit.Undo  

FileMaker - Undo  

AWS Cloud9 IDE (Windows) - Remove to Line Start  

Microsoft Visual Studio 2017 (Most used shortcuts) - Edit.Undo  

jEdit - Collapse fold containing caret.  

Atom (Windows) - editor:delete-to-beginning-of-subword  

TradingView - Remove to line start  

Chromebook and Chrome OS - Delete the next letter (forward delete)  

PuTTY - Delete backward from cursor  

Q-Dir - Go back  

mpv - Reset video zoom, video pan-x and video pan-y to 0  

PotPlayer 1.7 - Title menu  

Lock On: Modern Air Combat - Track edit Insert mode (don't disable Old editing commands)  

Lock On: Modern Air Combat - Insert video edit mode toggle (replace mode is on by default)  

Irssi 1.2.3 - (delete_previous_word) Delete the word before the cursor  

Frescobaldi 3.2 - Go to previous position  

Finale 26 - Tool: Eraser  

Finale 26 - Tool: Eraser  

Outlook 2019 and Outlook 2016 - Undo  

Microsoft Access 2019 - Undo typing  

MYOB AccountRight - Undo  

Edraw Max 9.4 - Undo text editing  

Salesforce - (Windows) Delete to start of line  

Salesforce - (Windows) Delete to line start  

MetaTrader 5 - Cancel object deletion  

KiCad 5.0.2 - Leave sheet  

Eplan Platform 2.9 - Undo last step  

Altium Designer - Undo  

Altium Designer - Restore the active Multi-board document to its state previous to the last operation. Multiple levels of undo are supported  

Altium Designer - Restore the current document to its state previous to the last operation. Multiple levels of undo are supported  

Femap 2020.2 - Undo