physics: fix a lot of problems

vgui2/vgui_controls/TextEntry.cpp

@@ -1484,7 +1484,8 @@ void TextEntry::OnMousePressed(MouseCode code)
 			return;
 		}
 
-		g_pInputSystem->StartTextInput();
+		if( IsEnabled() )
+			g_pInputSystem->StartTextInput();
 
 		// move the cursor to where the mouse was pressed
 		int x, y;

vgui2/vgui_controls/consoledialog.cpp

@@ -652,6 +652,9 @@ void CConsolePanel::OnTextChanged(Panel *panel)
 	// see if they've hit the tilde key (which opens & closes the console)
 	int len = Q_strlen(m_szPartialText);
 
+	if( !len )
+		return;
+
 	bool hitTilde = ( m_szPartialText[len - 1] == '~' || m_szPartialText[len - 1] == '`' ) ? true : false;
 
 	bool altKeyDown = ( vgui::input()->IsKeyDown( KEY_LALT ) || vgui::input()->IsKeyDown( KEY_RALT ) ) ? true : false;
@@ -1253,4 +1256,4 @@ void CConsoleDialog::OnKeyCodePressed( vgui::KeyCode code )
 	{
 		BaseClass::OnKeyCodePressed(code);
 	}
-}
+}