Use GetKeyIndex for Z, Y, C, V and X keys to make sure they go through ImGui's key map.

TextEditor.cpp

diff --git a/TextEditor.cpp b/TextEditor.cpp
index 8721641..a25896c 100644
--- a/TextEditor.cpp
+++ b/TextEditor.cpp
@@ -465,11 +465,11 @@
 		io.WantCaptureKeyboard = true;

 		io.WantTextInput = true;

 

-		if (!IsReadOnly() && ctrl && !shift && !alt && ImGui::IsKeyPressed('Z'))

+		if (!IsReadOnly() && ctrl && !shift && !alt && ImGui::IsKeyPressed(ImGui::GetKeyIndex(ImGuiKey_Z)))

 			Undo();

 		else if (!IsReadOnly() && !ctrl && !shift && alt && ImGui::IsKeyPressed(ImGui::GetKeyIndex(ImGuiKey_Backspace)))

 			Undo();

-		else if (!IsReadOnly() && ctrl && !shift && !alt && ImGui::IsKeyPressed('Y'))

+		else if (!IsReadOnly() && ctrl && !shift && !alt && ImGui::IsKeyPressed(ImGui::GetKeyIndex(ImGuiKey_Y)))

 			Redo();

 		else if (!ctrl && !alt && ImGui::IsKeyPressed(ImGui::GetKeyIndex(ImGuiKey_UpArrow)))

 			MoveUp(1, shift);

@@ -499,13 +499,13 @@
 			mOverwrite ^= true;

 		else if (ctrl && !shift && !alt && ImGui::IsKeyPressed(45))

 			Copy();

-		else if (ctrl && !shift && !alt && ImGui::IsKeyPressed('C'))

+		else if (ctrl && !shift && !alt && ImGui::IsKeyPressed(ImGui::GetKeyIndex(ImGuiKey_C)))

 			Copy();

 		else if (!IsReadOnly() && !ctrl && shift && !alt && ImGui::IsKeyPressed(45))

 			Paste();

-		else if (!IsReadOnly() && ctrl && !shift && !alt && ImGui::IsKeyPressed('V'))

+		else if (!IsReadOnly() && ctrl && !shift && !alt && ImGui::IsKeyPressed(ImGui::GetKeyIndex(ImGuiKey_V)))

 			Paste();

-		else if (ctrl && !shift && !alt && ImGui::IsKeyPressed('X'))

+		else if (ctrl && !shift && !alt && ImGui::IsKeyPressed(ImGui::GetKeyIndex(ImGuiKey_X)))

 			Cut();

 		else if (!ctrl && shift && !alt && ImGui::IsKeyPressed(ImGui::GetKeyIndex(ImGuiKey_Delete)))

 			Cut();