Revert "Don't trigger a key event if a key with the same associated c…

…har was pressed (minetest#13773)"

This partially reverts commit d57c936.

The reverted commit prevented recognition of key combinations.
It correctly changed a test case to no longer use “KEY_NUMPAD_5”.

Several keyboard layouts use a key combination to input a “+” (e.g. Neo2);
therefore some users could no longer input “+” to increase the view range.

Co-authored-by: savilli <78875209+savilli@users.noreply.github.com>

src/client/keycode.h

@@ -38,9 +38,7 @@ class KeyPress
 
 	bool operator==(const KeyPress &o) const
 	{
-		if (valid_kcode(Key) && valid_kcode(o.Key))
-			return Key == o.Key;
-		return Char > 0 && Char == o.Char;
+		return (Char > 0 && Char == o.Char) || (valid_kcode(Key) && Key == o.Key);
 	}
 
 	const char *sym() const;

src/unittest/test_keycode.cpp

@@ -126,11 +126,4 @@ void TestKeycode::testCompare()
 	in.Char = L'\0';
 	in2.Char = L';';
 	UASSERT(KeyPress(in) == KeyPress(in2));
-
-	// Irrlicht sets chars to the according digit for numpad keys.
-	// We need to distinguish them in order to bind numpad keys.
-	irr::SEvent::SKeyInput in3;
-	in3.Key = irr::KEY_NUMPAD5;
-	in3.Char = L'5';
-	UASSERT(!(KeyPress("5") == KeyPress(in3)));
 }